Is it bad that I gave him a second chance? (very longggg!) But i need some advice :(?

Lately my boyfriend and i haven't been on good terms. We have been dating for 10 months now. We really do love eachother were very close and its a serious relationship. Were bestfriends. We've been fighting a lot and ive been getting the feeling that he's talking to other girls behind my back so i put him to the test. I made a fake number on my ipod and texted him pretending i was a girl at my school. He believed it and continued talking. (not to mention he says he doesnt talk to other girls or text other girls at all) So i continued the convo and was saying things like how i missed him and we need to hangout again and be good friends.. so then the conversation got a little more friskier and i said so how are you and your girlfriend. He said were not doing so well i dont think were gonna make it. And i said things like well we should hangout this weekend you should come to my house. And everything he was saying involved a lot of smiley faces and flirting. But he was saying yes to everything and talking about doing "stuff" together.. During this whole convo pretending to be this girl, I was texting him on my cell phone while he was lying to me the whole time. When i couldnt take it any longer i asked him to meet me at the corner of our steet (we just live down the street from eachother btw) and i showed him the texts and everything and i was crying my eyes out and he was so shocked it was really me. We ended up both crying he was so embarrassed and petrified. He had no words to say but tears running down his face. I never he'd do anything like this to me, but he sat there and apologized to my face a million times. But this is a really serious thing that went on i need true advice i really love him he's everything i've ever had and i know he loves me, the 10 months we've been together he's been the sweetest thing to me he shows that he loves me a lot. I'm really close with his family as well. Am i doing an okay thing? Please help i need some advice it would be greatly appreciated!