Mortgage advice due to split

Sorry this isn’t baby related but I didn’t know where else to ask general advice. Have a joint mortgage with my partner of 8 years, we have a 2 year old and I’m currently pregnant with our 2nd but the relationship has turned awful, he’s drinking all the time and so angry I’ve decided this isn’t what I want he doesn’t want to make any changes even with the thought of a 2nd in the way and the endless pleads from me. Im so heartbroken but My question is what the hell do I do ! I’m so scared of being homeless especially with a baby due in July but we’re not married and he’s made it very clear if he’s paying more of the bills (which he does as he earns more) then he’s not moving out to continue to pay those bills and I just feel trapped 😭 I have no family around me to help. any advice would be appreciated x