Boyfriend touching me

My boyfriend keeps touching me in my sleep (I pretend to be asleep so he doesn’t force me into sex) like full on fingering me sometimes and I don’t know what to do anymore I’ve talked to him about it and he just says he can’t help it but that’s not a good enough excuse for me. I love him and everything we’ve been together for 4 years and we have a daughter together and this has only just started happing recently

Update: I know all this and I want to leave him but he threatens to kill him self I just don’t know what to do anymore

UPDATE: I’ve spoken to him about it and we got in a massive fight now we are no longer on speaking terms for now