Lately I feel like my boyfriend has been distant, acting less affectionate than normal. He doesn't hold my hand in public, or kiss me or anything like that. When we sit on the couch he leans almost away from me and never really acts first. I had to initiate sex and after i felt like I wanted connection and he laid with me and everything but then got up in a few minutes. He isn't cheating on me, I know that for a fact. I guess I just miss him surprising me and random kisses and showing me off to his friends. Sometimes he actually yells at me if I say something he doesn't want me to, for example I was apologizing to his mom for something someone else did and he said just don't and it makes me feel worried. 

Am I overreacting or is this a real problem? What can be causing it and how can it be fixed? 

Thank you for your help!