Do not make any decisions yet.  You are in shock. Give it a month. Have you deactivated her facebook account?  I agree with Jack. I would also get individual counseling to figure out what you want.  Also if you get marriage counseling get a counselor that specializes in infedility.  

  You are absolutely  right to feel how you feel but remember  she is still the mother of your child. Taking her back is something  you have to decide on your own. I wouldn't  take her back but that's just me. Her actions could cause harm to you and your child because of  this psycho. Listen if there is no trust there is no relationship. You need to be honest and tell her she was pure and perfect in your eyes and her betraying  you cause you to see her in a different  light. Don't feel guilty  about your feeling. Why did she confess? Did he threatened  to tell you. If she can't be honest on why she did what she did there is no reason to trust ever. If you were neglecting her like she claims then why not talk to you first before trying to bed another man. Has she done this before? Is she crying  because she lost her meal ticket? Too many questions  to ask.  You making a decision  right now is not in your best intrest. Too much emotions. Family sometimes make it worst. Take  time for your self and think. Look back and see if there may be other times you may have wondered  or had suspicion. IS THE BABY YOURS? Even if your sure make her go through  hell. Take DNA test make it so that she won't do it again. Your kid needs to be in a healthy  environment  and her stupidity  can cause harm to the child. Now you always  hear relationship  are 50/50 that's bull shit. You put 100% in and she puts 100% in. It's all or nothing. When she tell you that you weren't  paying attention to her respond with this. When you was flirting with the other guy did you think that would of help. You think that will make me pay more attention  to you. Just like she took time to write the other guy she could of wrote you a message saying hey I'm lonely. But no she wanted to be a slut. She needs to realize you are serious. Block her off of face book and tell her she can call and contact who ever she pleases.  The reason you get mad when she apologizes  to you is because you can smell the bull shit. Again your decision but do you really want to be with someone that dumb? Good luck and update. Advice  from a counselor  married 18 years.

I agree with ANgel.  DNA your child.  Even if the child is most likely yours the seriousness of the situation will be driven home with your girl friend.  You can pick up a DNA kit at many drug stores.  They are relatively cheap.  I would also insist your girl friend get tested for STD. 

  Look man women are difficult  creatures and are all different in many ways. She might have put a wall up to stop feeling the guilt and pain or she doesn't  care. Either way  it doesn't matter. Like I said before if you are not willing to put 100% in to the relationship  find someone who will. Be a good, no no no be a great father and move on. I normally  would tell people it's your choice but this time just move on. Are you going to be the only one fighting  for the rest of your life in this relationship. Women tend to hide them self from who they really are from fear of shame. If you can't talk to each other you can't know how to fix the problem. Go to Walmart and buy a furniture  you have to build. Do it with out the instructions. You will see how hard it is. Imagine doing  it with something much more complex.

To the girlfriend  if your reading this I don't care what drove you to commit this act it could have been handled  by  talking. If your not in love with him you should of just said so. People make mistakes  and it's a human trait but not acknowledging  your wrong doing is animalistic. It might work in  the bed room but not in a relationship  where two parties claim to love each other. If you needed to find yourself  or wasn't  sure what you wanted it should have been decided  before you made a commitment. Now if you truly love this man you better fight. We man are not emotional ( most of us ) and can fall out of love easily  when being betrayed  or dishonored  by the one who we love. You will wake one day and see you babies father be the man you always wanted with another women. I can give you numbers of women who will tell you there stories and regrets. 

I tell you one story. A wife cheated on her husband because he wasn't  adventurest in the bed room. He found out and left her. 4 years later he married. Thats when she realized she was still inlove. To make matters worst she new details of there  sex life( she found a sex video using his laptop ) . Everything  she wanted was being done to the other girl. Her words I was forever broken seeing my husband ( noticed how she didn't  refer to him as ex.) With this other women. If only I would have just talked to him. Fuck it I'll give you details. She just wanted him to pull her hair and call her a whore. That it. Simple. But no she did what you did found someone  else to replace  what you needed in another man who later married her cousin. Lol life's a bitch. Don't play with people's life.

When mature adults screw-up - especially when we royally fuckup - we take ownership, own up to it and do something about it. I had issues from my past (e.g. PTSD) that was affecting my relationship with my wife to the point of collapse. I hit rock bottom and went to individual and couple counselling because I love my wife and family and I know I am responsible for the health of my psyche and that of my relationships. Your wife is trying to pass this off as your fault for her lack of respect for you and your relationship, and you have played a part to some extent (no one is 100% wrong or right) BUT you did not deserve this (no one does). The fact that she is not taking ownership suggests she is either not capable, too immature, and/or feels that it's not her fault. Either way, you need individual and marriage counselling to get through this - even if you split up - to help you move on one way or another. Your relationship has hit rock bottom - you know it but your wife does not. I suggest you make sure she knows it's rock bottom from your perspective and you both need to be onboard to fix it now or leave it.   

*

Last update guys I tried to continue things and get them back in working order yet she's always being a jerk she's always silent and she keeps begging me to let her stay when I suggest these things. I'm at a breaking point to where she is no longer taking this seriously and thinks I'm a damn idiot or something I feel like she's trying to cut a hog in the ass but as I play along I am far from stupid or underhanded anymore. I've got this bitch in a corner she either can grow the hell up or go what do you guys think?

Topher you are confusing. What the hell are you talking about. Who cheated and if you cheated while she was pregnant then how can you be mad at her now. Let bygones be bygones

And from the tone of the second update, looks like girlfriend got into his account and is spoofing.