My heart is torn. Please help and dont judge me

Im newly divorced with 3 kids. I have a boyfriend, we started 5 months ago. But i broke up with him last night for the reason that i want to give a chance of my ex, thinking maybe we’ll have a complete family again. I broke my boyfriend’s heart and I feel so horrible, he gave me 4 weeks to come back. I dont know what to do. What if me and my ex wont work anymore. What if we do? Im able to give my kids a complete family. But i also love my boyfriend.