Its about this guy who behaves in a strange manner !

Its this guy in my hostel with whom I am in love with since about an year. We secretly have sex in private .But the problem is that at times he behaves in a peculiar way.He ignores me and tries to dominate me.I am a kind of person known for my own dominating personality but with this guy I behave in a meek way.I act like a beggar before him.I have tried to control feeling for this guy but in vain.I always do what he like lest he should get angry with me.All this kind of feels suffocating and I feel weird when I find myself acting like a crazy person.Please tell what should I do.I have let myself in a sort of depression !