Don't know what to think

So a in July when my boyfriend got back from band camp, I had felt like something had changed. He was acting different than usual so I started talking to one of my guy friends and we got super close(which i wasn't planning on) and we ended up saying i love you and kissing like once or twice. I don't even like him anymore which makes me regret it. After all of that it had really torn apart my relationship, we've had many problems but they've gotten worse. Today I went on his facebook without him knowing (cuz we agreed to that) and I know I don't have anywhere to say anything but he told this girl (which I didn't like to begin with) that he loves her. I've always had this feeling that he liked her. The guy that I used to talk to (the one I talked about earlier) my boyfriend told him to tell him if I talk to him or text him and also said that he's probably going to break up with me soon. I just don't know.