About 2 months ago I went in to an auto shop to get my car worked on. The mechanic was really nice and knowledgeable about what needed to be done to my car to get it going and on the road again.  My boyfriend had looked up this place and while he was at work had me take the car in.  So I took it in. While we were in this machanics  office talking about what needed to be done to the car I felt this immediate attraction towards him so mucjh that I couldn't bear to look him in the face. After that was over with he kept  my car for about three days to do all the maintenance work  that had to be done to it.  About two weeks goes by and I don't hear from this mechanic again. Then one afternoon I get a text from him asking how the car is driving and if I've had any problems since.  It kind of took me off guard because I wasn't expecting to ever see him again or speak to him again. So I text him back that the car was running great and I didn't have any issues since he had worked on it.  What happened after that was a big blur. We continued to text each other that whole day.  We texted about everything from his life growing up to where he was born I learned so much about him that first day as he did me.  He asked me to go out with him to grab some coffee. At first I was a little hesitant and he reassured me he wasn't trying to get at me he was aware I had a boyfriend.  So one night my boyfriend was gone and me and mechanic guy were texting each other he had mentioned that we should meet up and say hello in person. So I gave in and went to his shop to meet up with him.  When I got there I was a little nervous since the last time I was at his shop I was bringing my car in.  Nonetheless he made me feel comfortable and asked if I wanted to go on a drive with him I agreed. We drove towards The Oceanside specifically Pacifica.  When we made it to the beach he said that it is the place he goes when he gets stressed out about work and life in general I thought it was the sweetest thing anybody has ever did, it was very spontaneous and I like spontaneous.  From then on we grew this very close bond.  One night we sat in his office and we ended up kissing and having sex. Now I feel very guilty about everything I've done to my boyfriend. So much so that I want to change my number and forget mechanic guy. Mechanic guy says he's  not in love with me but cares for me a great deal and sees that he could be with me in the future. Should I just cut it off now and remain with my own boyfriend that loves me?