Getting back? Has he changed? Will he change?

I left my baby daddy about a month ago. We have done this multiple times where we break up during this time of year and by January we get back together. We’ve been doing this for 2 years. Well we have a 2 month old and I left him right before Halloween and now he’s asking us to come back and move back home so we can be a family he says he will get back on his meds and go to therapy. I am living with my mom and as much as I want to I’m not 100% he is ready for us but I am so tempted to go back but my mom she wouldn’t be happy about it and we just barely started building a relationship with each other. and if I leave I know it’s gonna destroy it because she doesn’t want me with him. She said he has to show 6 months of change before I move back. What do I do? We broke up because he wanted to party and stuff and we argued all the time.