Pregnant and alone

My bd of 7 years left me and my daughter may 9th of this year. I'm 24 weeks pregnant and I have a 5 year old. He said he caught feelings for some girl so hes been cheating on me and he's been in the hotel for 3 months. This is her first fathers day without her spending daddy day with him. It saddens me he hasn't seen her in 6 weeks. He doesn't call text nothing.!!! I did finally go to child support because basically he just walked and neglected his duties like how can u say u love ur family but u basically left us for a little ass 19 year old girl that has nothing and he's about to be 31. I never had to be a single mom before and now I'm pregnant I have to stay sane for the baby and my daughter. I been coping so much better maybe thinking this is temporary for him and maybe when the baby gets here he will decide to be a damn father again but the betrayal of u leaving ur family to lie and cheat for a bitch.!!! I just can't believe he would do that to his kids. This is beyond the worst pregnancy ever for me cant lie and I'm tryna be strong for my kids. I have to.work doubles and do extra things a week to maintain like with no damn help its all me. At the end of the day I feel I got this I have to first my kids but this is something to get used to for sure. I don't know how people manage to get through this at all but I can't believe he is in a hotel with a slow junkie while we need him at the house and his daughter wondering where he is. What a damn joke.