Feeling lost beginning my 2nd trimester alone

My S.O. (2yrs) left over an argument regarding his time & communication. I’ve been ultra sensitive since I’m 3.5 months pregnant w/ my 1st & says I need time apart from him to prove I can be more self-sustaining & change my moodiness. I’ve been knit picking his job because it takes up most of his energy & now he’s been staying w/ a very negative, bitter coworker who gives him things to keep him codependent. I feel abandoned after 3 weeks of living in our home alone. If I try to discuss the matter in person he goes on that I haven’t changed so he’s not ready to come back & then wants to bounce. He’s now communicating w/ me minimally & says he doesn’t think we should hang out to avoid arguing or disagreeing on what is going on between us just yet.. Yet? I figured he was emotional about becoming a father & needed space to consider all his feelings but the guy he’s staying w/ is an angry naysayer that isn’t in a stable marriage & has never been friendly w/ me. 3 weeks is a bit much. I’m so confused & my heart is aching.. Last month we were discussing marriage & when. We haven’t announced yet & don’t want to w/ out him. Most of my family is non-supportive generally

so I don’t have anyone to vent to.. Help