I understand, been there. Just a tip find new things that turn you on. Talk about sex together. I'm having to find new ways to ignite that fire between my legs cause I have been in a slump since the baby to, and usually I want sex all the time. A sex.life is soo important to me cause its a natural way to feel good and enjoy your partner. Hell masturbate together or try to please him in different ways. I understand how it can make you upset when he does that though. Just a thought but take pics of your nono areas and have him masturbate to that. That may make you feel better, at least he's getting turned on by you. It will eventually get better hang in there.
Talk to him he has needs and if you cant meet them its better for him to masturbate then cheat but still not okay in my eyes i would be hurt too but hes a man he needs sex..good luck
I think if you are hurt by it tell him,I'm the opposite right now I want my fiancée more, but I tell him to masturbate ifhe feels the need to.I'd much rather him do that than go out&possibly cheat.
He's not doing anything wrong though. At least he's not pressuring you and making you feel bad, right?