Confused much

I've been down lately about this relationship. I don't know but it's not that I get bored, but also because I find like I'm a fail gf. He has fun more with his other "girl"fwends but not with me. Fail much. Learning that he doesn't find to have fun, makes me sad. I don't know what to do because I am not only believing this but also losing hope and feelings of him. I don't know what to do. It's almost his trials and I admit I was about to break up, because I couldn't handle it. But as friend said, I have already involved myself in the danger zone. I can't. But there's also this feeling, how I don't want to lose him. But I guess he doesn't like me that much. Why hold on when he doesn't want to be in a serious relationship. I didn't get into a relationship for the sake of just having fun. I don't know what to do. Everyone says to hold on, but I'm scared I might lose control and repeat the same mistake. I'm scared I might let this affect my exam. I'm scared I might affect his HSC. I don't know. Can anyone tell me? :S