Boyfriend is stressing me out

Hello everyone me and my current boyfriend have been dating a year now. I am in nursing school and have so much to do and studying. I am also 12 weeks and 2days pregnant with his child I also have a 5 year old and I just started a new job working nights. My boyfriend keeps accusing me of not loving him and that I don’t care because I’m never around. He was working but got laid off cause his job closed. He does have bi-polar and just accuses me of not loving him when I try everything I can to show him I love him and it’s never enough. I’m already failing my two nursing classes we need to pass above 80% and I’m sitting in the low 60s. I don’t know what to do. He told me he’s upset because I got a job and he never sees me but I have to sleep during the day. I also have to support my son as well. My boyfriend says all I care about is my son and school when he knew how important school was to me before we started dating. I have swift rivers and we have to spend 7.5 hours on them to get hours to start clinicals and my boyfriend doesn’t understand how stressed I am when he says I don’t care about him. I don’t know what to do anymore. My love language is helping him out and being there for him but it’s not enough. Any tips. Thanks everyone