Officially Single and Fed Up

So my once boyfriend, turned fiancé, now ex has decided he wants to be single while I’m 4months pregnant. We have been off and on for 7yrs. We have been broken up since July, a week or two after finding out that I’m pregnant. We still live together and were making the effort to try and make things work out. Then he tells me he wants to stay single. In the midst of that convo he says he’s not messing with anyone but that if and when he does he’s going to tell me before hand or shower after and sleep on the couch. At that point I felt all respect has been thrown out and want to put his ass out now. However, we have a son that is in school and has ABA and I’m working right now. So him being here helps with that. I don’t know what to do because he clearly wants to live a different life but I don’t want to have to quit my job just to get the space I need.