What do I do

I always catch my baby daddy/boyfriend looking at other girls. I swear he always looks at their butt, to me it’s like he’s checking them out. I’ve told him honestly for about 2 years already that it bothers me. I gave birth a few months ago and my body is literally trash. I hate my body now even more. And it makes me so insecure when he checks girls out especially in front of me. Idk what to do😢 And it’s literally every girl that crosses his path