In this without any support from the father

Well at my age I never found myself being so un grounded I was married my children by my ex husband house love etc they say the grass isn't greener well ladies it isn't now im 7 months with another baby father who hasn't done anything I mean anything the least he hasn't done I found myself miserable and sad the entire 1st and into 2nd trimester thinking how ashamed I am to have fallen so low in this rut I have no idea what to expect or even think if he would be there for my 1st daughter! I text him he reply but that's as far as it goes never to get any answers from any question why the sudden change? we were close it was toxic and I always felt a miss with him those are quest I asked which I learned to know is irrelevant, now even more irrelevant I suspect he's off with someone new and that's why he suddenly said f me in this sit how do I know the next person won't come around and he do this to my daughter? Guys I'm so not knowing anything rn it's crazy went from sugar to shite now that I look back that rebound is a mf you know! im getting closer to delivery with no change in him that I thought would come how do I act as if my pain wasn't there if he decides to come in last minute? and be there it seems he's the type that brightens up just long as he gets his answers or action after that he back to himself the non supportive selfish person he is the pregnancy is hard for me as I'm high risk im used to caring for a baby I won't need him once she comes how do I not inconvenience myself no more with him? whats my first course of action once I deliver including should I even invite him to the birth?