My husband left me pregnant and with our 1 year old

My husband left me. I am 23 weeks pregnant and we have a 1 year old together. He said he was leaving because of nitpicking things that I didn’t know was bothering him. I don’t want him to go. I tried crying and begging. It didn’t work. I put myself together when he told me he didn’t want to try to fix this. I didn’t show any emotions. I packed mine and our daughters things and left. When I left I saw the man he used to be in his face. What do I do to get him back? Should I want him back? He’s been acting weird at work as well. Unplugging the GPS in the work truck telling his boss (my dad) that he’s somewhere and they use the second tracker and he’s no where near where he said he was. It’s like a switch was flipped and he was different. What do I do? I don’t want this to end.