How can I make him understand?

*******So let me start off by saying that I have tried talking to him about it and it doesn’t seem to ever get anywhere. ********

My bf and I have an amazing relationship. We are extremely happy together, we are soul mates. I love him more than I’ve ever loved anyone (well him and our son ♥️)

But lately, something has just been bothering me so much, I guess this post is more to vent than anything.

I have recently found that he looks at other women on social media all the time, sexy women, with sexy pictures. Most of them we know personally, I have reason to believe that he masturbates to them as well. I feel our sex life is lacking because of it. I feel unwanted and ugly. I feel like he finds these women more attractive than me and prefers to get off on them over me. Even when I’m right there asking to make love to him, he’ll say he’s too tired or not in the mood and then go masturbate in the shower hours later. I know that after I gave birth my body isn’t nearly as sexy as it used to be, maybe that’s why. I have deflated looking breasts from breastfeeding our son and stretch marks on my stomach. I just can’t help but feel like I’m not good enough for him anymore.

I’ve tried to talk to him about how him looking at other women makes me feel but he just denies it and changes the subject. I get that men naturally are attracted to women and I normally wouldn’t care as much if it wasn’t for the fact that it’s affecting our sex life.

I’m pretty sure I have postpartum depression so I don’t know if that plays a role in this, (probably) I’ve never had a reason not to trust him. He is amazing to me. I just can’t shake this feeling though.

I don’t know what to do. Should I try talking to him AGAIN, even though I know it won’t get me anywhere? Should I pretend like nothing is wrong and just get over it? Should I do the same and make him jealous, give him a taste of what I’m feeling? Idk, opinions please?