We've been going out for a bit now. Long distance sort of ordeal. Ive been going out with this chick, let's call her Samantha. For id say about 5 months. We've met through a friend of mine and we hit it off great at first. Later I start realizing that she has this impulse with social media. Fast forward a little later , she ends up being insecure about it. Legit calling me when I'm out with the guys and basically telling me not to talk to any girls out there which at the time included friends. Crazy huh but I said hey why not let me give her a shot. So fast forward 4 months. I'm working hectic hours(being in the military) and I haven't been able to talk to her for a good week or so. I'd text her when I could but that's only during my down time. I get done with the week and as you could have guessed it she has gotten upset that I wanted to go to a restaurant to get a burger and just unwind a bit with my buddies. She got upset and I'm sure in spite told me that a guy she had previously talked to before messaged her. I got a weird feeling In my stomach and decided to go on Facebook to which my surprise she quickly logged on. She sent me screen shots of the conversation and made it out to be like he just messaged her and looked like he was trying to talk to her, not anything flirty but still weird. 2 weeks down the road I asked her again if she was telling me the truth and she admitted to deleting a couple messages so I wouldn't get mad. We break up maybe 2 weeks later and she blatantly added this guy on Facebook and made it obvious. Out of frustration she called him and texted him the same day we broke up. Samantha then calls me up later throughout the day and by then I knew what happened and basically was getting over her and knew that it takes two to tango and that I shouldn't try to go after her. She's crying on the phone and tells me all that lovey bull crap and I soaked it in and gave her another chance. So she didn't exactly cheat on me but just acted straight weird about the whole situation. I'm not sure if these type of actions are forgivable or what. I know she didn't physically meet up with the guy given that he was far apart also at the time. Maybe I should just keep her for now and later on down the road dump her and meet someone with trust. 

I don't like revenge, it takes away from my character. My mom was cheated on and I vowed never to do the same to a woman. I'm 25 years old and I'm sure the only reason I'm with her is because I'm getting old and I kinda want to settle down. What do you guys think? 

I know people can be forgiven but Ive honestly never been in this type of scenario.