I am in love like crazy but my boyfriend makes me unhappy should I leave him or what I should do?

I’ve been best friends with my boyfriend for seven years and after I moved to another city we started to miss each other so much. Every time I would go back to my hometown I would spent most of my time with him until we got drunk one night and ended up in bed. We are in a sort relationship since two years now. After sometimes I felt in love with him and I noticed that he doesn’t feel the same, he is the same girl hunter and that drives me crazy. I can not tell him how much I love him because I am afraid that might scare him away and I don’t want to lose him because when we started we promised to keep our relationship a secret and not to fall in love wwith each other. I don’t know what to do? But if I lose him I think I will kill myself. Help me?