No sex??

Since I got pregnant me and my bf really aren’t having sex anymore...we went from doing it everyday to like once a week(not because of me, this is all him) !!! Wtf?? I keep asking if he wanna have sex and he always just wind up falling asleep on me, thing is I know he jerk off everyday if he doesn’t get any so he’s not even doing that anymore. I know he’s not scared to hurt the baby because we have other kids and it never stopped him then. -no depression either...so what gives??