getting mad over not having your butt covered

My boyfriend Gets so mad when I go in public without my butt being covered and it's so frustrating Because I have to try on like 50 outfits to make sure I don't look stupid, when I don't have a shirt to cover my butt every single day. It makes me have a break down because of how frustrating it is. 
I mean wearing anything in general. I don't wear tights because he doesn't let me. If I wear like shorts and a shirt and my butts not completely covered he'll flip out.