Husband acting weird

Husband is still chasing after bitches we have 4 kids and another on the way and he lies so much I managed to go into his FB and Instagram and his messaging them acting all desperate and he doesn't want to know me at all like why is he acting like this? I need advice I can't just up and leave as I have little kids and wouldn't be able to cope on my own but it's making me resent him alot there was one woman in particular who knew the in details about our marriage saying 'oh you said things are looking up between the two of u' and he said yeah better but still room mates which pissed me off and he doesn't want to know me in the bedroom either