Need some advice. Idk what to do.

So a little backstory. I was with my baby daddy for 5 1/2 months. I got pregnant with my son when we had been together for about a month. He was bad on drugs at the time and ended up stealing from me and my family while he lived with us in order to support his habit. I ended up leaving him when I was 4 months pregnant due to him stealing from me and my family. I went thru the rest of the pregnancy alone and had my son without him there, my son is now 4 months old and he barely met him this past weekend. I paid $70 to take a bus to him and paid for half of our hotel. He isn’t on drugs anymore and wants to fix things between us. I still have love for him but idk how I could ever trust him again after everything he did. I don’t know if I should get back with him or not. It’s so hard being a single mother. I make minimum wage (7.25 an hour) and my son is going thru the 4 month sleep regression. I’m about at my wits end and just want some help from my baby’s father. When we spent the weekend together he did help me a lot and was a good dad to him. Of course I know this was only a weekend so it’s not a true indicator of what kind of dad he would be... his family is willing to help as long as I keep bringing the baby around.. I just don’t know whether to get back with him. Part of me doesn’t want to but I also want help with my child and I feel like the only way he’ll help is if we have a romantic relationship. Because before I started acting lovey dovey with him he didn’t seem to have any interest in my son.