Should I stop thinking about it? Did I make a good decision?

I meet this guy at a party we talked and we even kissed that day he wanted to go farther but I said no.. 2 days later we where talking on the phone he asked me to be his girlfriend and I said yes 2 months ped by I was starting to grow feelings for him till I find out by this guy that my bf had been at dis party dancing with this one female I was pissed off my bf said they where just dancing and he had told her he had a gf then the same guy comes and tells me that they where in a nother party where dey where playing spend the bottle and they had kiss I was so mad and stared crying I called him and said it was over then hang up. He started calling me back and I wouldn't pick up so I said ok I'll let him talk so I pick up one of his calls he said he was sorry and blah blah blah that she the one that kissed him and all that bull he said he didn't want to lose me that he didn't know what he felt for me till he had kissed her if they hadn't kissed he wouldn't have know the strong feeling he had for me that I was his first real gf and that he only wanted me.. so I gave him another chance he has been so sweet since then we went out for a year and now we have been married for 7 months but i just can't stop thinking would he cheat again? I don't know if I made the right choice...? And plus I might be pregnant he is so happy.