Pregnant, lonely with no support

Hi everyone. I’m 17 weeks on my first baby which I’m so excited about. My partner of ten years has decided to just check out completely. Even though he says he’s excited about the baby. He works 7 days a week (by choice) and is gone out 7 nights a week with his friends which I’m never invited to and usually involves alcohol. He drinks pretty much every night. He comes home drunk and falls asleep on the sofa. He doesn’t want to do up the back yard like promised (back in April) and says it’s to early to start decorating the baby’s room. Doesn’t want to discuss names or pick stuff out. He doesn’t help me around the house (he’s never there) and gets mad at me if I ask him to help me out. The last straw was this week I was sick and had to go to the doctor. Had headaches, nausea, vomiting, breast pain. Turns out I have mastitis. Asked him to come home after work to help me make dinner and just look after me cos I felt so shitty. He wouldn’t answer his phone. Came home a few hours later really drunk and fell asleep on the couch straight away. If I say anything he tells me I’m just crazy and pregnant and I’m going crazy over nothing. But I know this isn’t true. I feel so upset for the baby being brought into this mess. Has anyone any advice on what to do. Will it get better or just get worse if I stay. I don’t really have anywhere to go and I don’t want to be a single mom but I can’t stay if he’s never there and never puts me first over his drinking and boys nights out. He is basically just treating me like shit. I’m so heartbroken.