Masturbation in a relationship

So I know that masturbating is super normal and healthy and I don't have an issue with it however, I have been married to my husband for over a year now and we have been dating for almost 7 years. I am currently 7 months pregnant and my self esteem is kinda down as I just feel like he is not attracted to me. I am really struggling with how much he seems to need to jerk off. Like we would have sex and that same night he would go to jerk off after I'm asleep I feel like I'm not good enough. He says that it has nothing to do with that and that he just needs that release. Idk I feel weird and filled with anxiety over this. He is an amazing husband i just feel so weird about this whole thing. I know that it's a me issue not a him issue but I just don't know how to deal with it. Vent over.

Any advice?