Sex issues in a marriage

My husband and I have been married for 4 years and since the start, we’ve had issues with our sex life. First it started out as him watching porn, then he stopped that and started just googling photos of girls and masturbating to that, then he stopped apparently and just masturbates—which I’m totally fine with but I’m not okay with the fact that our sex love suffers constantly. And now, after four years of this being a problem, and this being the only reason we argue, I just get so angry and I feel so hurt. I feel like I’m not enough. That I’m not pretty enough or good enough. He works nights now and I have done everything I can think of to make it easier on him—I’ll stay up late with him and even make moves and he still doesn’t even try.

This is how it goes: we will sometimes go to bed together depending on how late I stay up with him (like we did last night) and we will go to sleep. During the night, he will wake up and just be on him phone looking at Reddit or whatever. I tried to make moves on him last night and nada. He got up soon after and left the room completely and didn’t come back until 8 AM this morning. (Downstairs or in his man cave for probably 5 hours)

I’m sexually frustrated and I communicate with him about this constantly. He says he’s sorry all the time and clearly gets aroused sometimes when he’s around me but never acts on it. It’s been a problem for so long that as much as it’s against all that I believe and want for my family, our marriage isn’t going to work out.