Sex postpartum

So my husband and I have not been having sex regularly at all. Maybe like once or twice a month. It’s is because 1, my husband works overnights 3-5x a week and we have a 10 month old baby boy. Our son is still not sleeping through the night, well I guess that’s not true. He will sleep through the night if I’m holding him which obviously is difficult. It’s so bad that when I put him to sleep and lay him down he will only stay asleep for a very very short period of time and then wake up screaming until I hold him and he goes back to sleep. And repeat. On the one or two good nights a month he will stay asleep for at least an hour without me and so my husband and I will be able to be intimate. But he’s my thing, this doesn’t bother me. I understand that my son won’t be this way forever, it’s just a phase and I know that eventually me and my husband will get back on track with our sex lives and it’s not that big of a deal for me but to my upset it’s very upsetting. I try to sympathize with him but it’s hard because he doesn’t sympathize with me. He always talks about how he’s sexually frustrated and has admitted to masturbating to porn and it hurts my feelings because this is not my fault. I’ve tried so many things to get my son to sleep without me but nothing has worked so far. I get angry because it’s not my fault. I know for a fact if my son slept through the night I would have no problem pleasing my husband on his nights off from work but It hurts to know that when I’m trying to comfort our son and get him to sleep my husband is downstairs watching porn. Idk what to do or if my feelings are valid but I just wanted to share. It’s hard talking to someone who is just completely opposite of me when it comes to being sexually active.