Husband isn't affectionate with our children

I just had a third baby. We have a 5 and 7 year old. My daughter recently started asking why my husband doesn't hug them and things like that. My husband has never been an affectionate person. He doesn't like hugs. He doesn't like affection. When he was 5 his mom basically fell in love with someone and she took my husband away from his father to go with this guy and join a cult. So he was pretty much raised in a cult. His mom ended up leaving the cult when he was 10 and just... Left him there. He escaped that cult when he was 22. He found out his mom has passed away and doesn't know how to track down his dad so he has no parents and trauma that he doesn't like to talk about. I knew he wasn't very affectionate when we got together. I understood. He also doesn't like to talk about what it was like to live in a cult but it's most likely contributed to why he's not comfortable with affection. He's a good dad and he loves our kids but idk what to tell them when they're so young asking why daddy doesn't hug and love on them.