No sex...

Posting anonymously because this is embarrassing for me. I have not had sex with my SO in well over a month now. It's not that I don't want to. He is not interested in touching me at all. I am 24wks pregnant and I realize I have gained some extra weight but I didn't think I would be that unattractive that he can't even imagine touching me anymore. He won't tell me what's going on so the longer it goes on the more sketched out I get. Has anyone gone through anything like this before?