Is it normal for a guy to fall for his best friend?

So... I have been best friends with my mate for the past eight years. We met in highschool and were close for years. We recently lost contact for about a year. I am 21 and he is 20. I am a recently out gay and he a bi sexual. Took us both a while to get there. In the past few months we became really close again. As if nothing had ever happened. It was in this time I realised that I felt something more for him. I told him of this via txt and he said to talk it over. We discussed this and it seemed he was.nt interested but he begged me to go back to his home and stay the night after our few drinks. I reluctantly said yes. When we got there we both laid on his sofa and talked for a while. I started to move my hand from his arm to his thigh and onto his chest. He allowed this and then placed my hand down his pants. I seen this as a possible invitation. But I may have been wrong. I moved on to begin givining him a bj. He was hard and from what I could tell up for it. But suddenly that changed and he told me to stop. I figured this meant no interest but after this he kissed me out of no where. I asked why had he kissed me and he said it was a friend thing all the time being aware of my feelings. We have.nt spoke of it since and he now has a girlfriend. I really just want to know what to do? Is this normal? I've always hated his girlfriends even since before I came out? I want to ask him can we stop takling until im over him. Any one similar?