Ive reconnected with an ex from 10 years ago

Long story short. We dated when we were young, late teens. We broke up and we both moved on. He’s dated a few people. I dated one and ended up marrying him. I am now getting a divorce. I moved in with my friend (who is the first ex’s brother). We have all known each other for 20+ years. We are both single and hung out last weekend and Monday night. We both agree we don’t want a relationship right now. I also told him I’m not the type to just sleep with people. And he’s perfectly fine with that. So we have only made out, cuddled and talked for hours. We’ve agreed to just go with the flow and see what happens. I’ve never done this dating or casual stuff. We are both 31 with no kids. Any advice? One part of me is like leave the past in the past but another part of me is thinking maybe It was supposed to happen like this? Haha idk