No sex for 3 months. Am I being selfish?

My husband and I have 3 kids together. I just had our 3rd 8 months ago. I'm not as beautiful as I used to be. I've gained weight. I've tried really hard to seduce him. Dress sexy and everything and I'm rejected every time. He is claiming these feelings are coming from stuff we are dealing with with our oldest son Kestner. Before Thanksgiving we moved in a family friend and we trusted this person. He seemed like someone we could trust. Kestner told us before Christmas that this family friend hurt him badly. We went straight to the police. My husband has been the main one handling things with Kestner because I work at a hospital in surgery on call. Some days I have worked 70 hours in one week. My husband works at a restaurant so it a bit more flexible. So he takes Kestner to therapy. If Kestner is having issues at school he's 14 so he can sit at the restaurant in the back while my husband works. Which we've had to do. My husband is saying he has no sex drive because of everything he's been dealing with, with Kestner. He has therapy twice a week. One day it's just for him and the other day my husband and Kestner do family therapy because my husband is also trying to fix his relationship with Kestner because he pushes very toxic masculinity onto him from a young age about boys/men and their emotions. So they're trying to fix that. My husband has also been trying to learn patience because since that happened small things make Kestner cry. I'm a very nurturing person so I know how to comfort my kids when they cry but since I work so much my husband has been having to learn about to comfort Kestner and unlearn his own toxic masculinity. We tried to have sex yesterday. I bought lingerie. Did my makeup. When I tried he said no straight away completely rejected. He said it was because he and Kestner did family therapy and listening to our 14 year old talk about sexual violence he experienced doesn't make him in the mood for sex. Our children are obviously our top priority but it does feel like because of what he's dealing with with our son that I'm completely being put on back burner. And I'm not asking for him not to be there. We all are there for him but those things don't stop us from having sex and he's letting them stop us. Hes claiming he's just exhausted from dealing with Kestner emotions and trying to be a better dad. I love that about him. Just wish I wasn't now being emotionally neglected

Edit: I'm not sure what his name has to do with anything. There are like 4 Kestners I know of in our city. Also as I said why I'm not able to go to therapy with them is I work a very demanding job and sometimes work 70 hours in one work week. Plus family therapy was supposed to be for my husband to work on his relationship with him because there's his strained. My relationship with my kids is not

Here for the women who think my name is so out there and uncommon. Regardless I doubt you will be able to locate my children based just on a first name that I know multiple boys have. And I'm an asshole for wanting to have sex with my husband? I thought we made it to a different time were women are learning their needs are important too but i guess some people still think men's need will always be important. What amazing girls girls you are