Exhausted

I feel so exhausted mentally and physically. I had my two girls when I was 21&23 I been doing most all the work. Idk what happened to the father he just fell off, just started doing dumb things, things that never worked out or would get him in trouble. I feel like after I had them he lost any little goals or motivation he ever had and at this point if he had any. My oldest will be 9 and youngest will be 7, I’m almost 5 months pregnant. Had an opps and knew I shouldn’t have gotten pregnant. However here I am. I been working two jobs at time and going to school thru my bachelors and associates. Now im working two jobs and going to school for my masters. While I feel like he is stuck in this depression state and just watching me struggle. I pay for everything/bill and take care of the kids and now preparing for the new one. He’s been trying to help more around the house but it just don’t feel like enough. Like I feel like he can pull more weight around the house plus get a job. I’m exhausted, I’m feeling so alone and don’t have anyone, even tho my family lives in the same city as me. Let’s just say they don’t really help. If I need a dollar or two they are more willing to help with that if they have it. Instead of help with the kids if they can. So I just been to myself. My best friend moved to GA and I feel like she going through so much and expect so much from me for emotional support and I literally have nothing left to give myself let alone someone else. Nov 2nd will make a year since my mom died and I never grieved her death really I just kept pushing. But I’m finding myself in the most vulnerable state I have ever been in. If I tell the father to leave, he’s the most support I have with taking them to school and picking them up and watching them while I work. Then I chance losing my jobs again and won’t be able to provide. This happened before when my family convinced me to kick him out. But I’m so exhausted mentally and physically and have nobody to support me that I feel like imma crumble and idk what else to do.