Need advice...long

We broke up bc we had some serious problems. I cheated on my ex and be with BF and got pregnant. And when I found out that I was pregnant I freaked out and told my ex, and ex thought the baby was his. I didn't know what I was thinking and screwed up, and BF was so mad and he broke up with me. He said he was hurt and just couldn't trust me anymore. 

Then I came clean with my ex and broke up with him. I was preparing to be a single mom I need to clean up my own mess. And my mom decided to come and live with me for 6 months and help me with the baby. 

Then a month later BF came back told me that he still wanted me. So we got back together. And we both agree to take things slow bc we want to do things right and we don't want any instability in our baby's life. 

But I'm still having second thoughts about everything. Like will he ever trust me again, how can we work things out and how can he bond with our baby if we don't even live together for that long. When we broke up I was so devastated I actually let him go emotionally and now things just don't feel the same as it used to be. I still love him but I'm so scared that he may leave me again. I know deep down I would never cheat again because of my LO and my love for him. I'm so happy that he's back but so scared. 

Sorry it's so long, just really need to vent and need advice.