Asking my ex husband out on a date

I'm struggling a bit right now with my love life. Back in 2021 I walked in on my father molesting my son. It absolutely destroyed me that this was going on and I had no idea. I later found out that my father had done the same thing to my brother when he was a kid. It disgusted me. My dad did not serve much time. He was supposed to serve 8 years but got out this year. So he served 3. My son is 16 now and I also have a 7 year old daughter. I think my son has healed more than I have because with therapy he's gained a trust for people back. He still has his trauma. He started up wetting the bed again after knowing my dad got released. We are working through these feelings in his therapy and I have my own therapy. My problem is that I don't trust people anymore. I've gone on a few dates and even when it seems things are fine. When they ask about my children and when they will meet them I freak out in my head and cut it off. All that goes through my head is this man wants to hurt my children. Because I would never have thought my father would hurt my son. And now look. My son's life was forever changed and he's always going to deal with that. What if it happens again because of someone I dated? What if someone hurts my daughter? Then I've failed both children. It's hard because I want love and to find it but I have a hard time trusting the world. My dad was a predator and my mom was a predator protector. One of my close friends suggested I just get back together with my ex husband. After everything happened it surprisingly brought me and my ex husband closer and we are practically close friends. This sounds ridiculous. We've been divorced almost 10 years and he's never shown an inkling of wanting to get back together. He picked up the kids for his week with them. He was asking me how our sons problems at night were going and I said he wears sleep protection again and told him when the next family therapy session is. He said okay. Then I asked if could talk about everything going on at some point going out on a lunch or something together. He said sure. Didn't seem like he gave it much thought. I know it's stupid to even entertain the idea of getting back with my ex husband. My brother said I'm being dumb and should just stay single until I've worked on my feelings and can trust humanity again. But is it possible to come together and have a happy life again? I don't know but I've heard about people getting remarried and it working out the second time.

Edit: No man I've dated have ever met my children. The second they ask is when I freak out and cut it off. I've never introduced men to my children because I'm afraid of them hurting my kids.