I need to know how to be better for my partner.

Relationship Problems

I am a 21 year old gay male, It has only been 2 years since I came out to the the world and fell in love with a wonderful man. I find my self being a jerk to him for no reason at all. I take everything he does and I turn it into a fight. I hate fighting but that is all we ever seem to do. My biggest thing is jealousy. I need to figure out how to get over it. I want to make this relationship work but I am unsure how to change myself to better us as a couple. I am really ashamed of my actions and I need to change them. Can someone help me please?