I have a really big issue I can’t sleep with my SO!

Ok so I’m not sure if it’s because I’m pregnant and just so tired. Or maybe I don’t trust him. Maybe he’s just not sweet to me, he’s an asshole sometimes well most times. Now lately his been disrespectful and staring at women and making comments and he never did that ever. I knew he would look but not as obvious as it’s been. I really just don’t know hat to do or what it is