Sex friends... long story

 So I have my friend we met like a year ago and the minute we met we started a really nice friendship I'm 20, he is 22 and after 8 months we got drunk and had sex one night with no protection and to make things more stupid it was my first time ( I know it was the biggest mistake)  after that happened I took plan b and everything went well, but our relationship was so screwed in so many levels, I couldn't look him in the eyes and recently we went to the movies and hooked up again, and we are not talking as we used to, things got weirder but in that area there's so much attraction, that I can't help it, my friend is a total player with ladies and I knew what I was getting into, I'm sure I don't have feelings for him, but our relationship has changed to the pointe where we don't talk in public and ignore our selfs but when we are left alone we start kissing and one thing leads to another, and I really don't want to because everytime we do this I think I lost my friend or we never were really friends :/