Is being friends with an ex you no longer have feelings for a bad idea?

Quick backstory, this guy and i dated in 2021 for only three months. I was a virgin at that time and was never able to open up completely, but i liked him a lot still. We didn't fall in love or anything serious. I broke up with him and we saw each other twice since the breakup (we hooked up). He messages me every now and then to check up on me. I moved on pretty quickly because even though he was a good guy, it lacked connection.

I met someone a year after we ended. I fell in love, hard. He’s my first love basically. We were together for 10 months. He made me open up, we became best friends while having the best sex I've had. Anyway, after a lot of bad fights and on/off relationships, we ended it for good last week. He’s also moving away (pretty far).

Coincidentally, around the time of my breakup (which is now) my first ex messaged me out of nowhere after months of not hearing from him. I asked if he wanted to hangout and i said i needed a friend. So we hungout. We talked, i told him about my breakup, he gave me advice, etc, we talked about when we were dating and how we never really became serious. We played pool, laughed, we were just being friends. No kissing, no hand holding, nothing. We caught up with each other’s lives.

He’s okay with hanging out again. I would bet my life we dont have feelings for each other at all. So is this still a bad idea to become friends with an ex? I dont know if he’s thinking we might hookup again, but i won't go there with him. I just have to make that clear if it gets confusing.
Updates
+1 y
He started messaging me a lot since we hungout. I started thinking maybe he’s actually okay with being friends. Starting to doubt that now. Anyway, I don't know yet what to do. I might avoid seeing him again because i need to process my breakup for a while anyway. And it seems he misunderstood my intentions.
Is being friends with an ex you no longer have feelings for a bad idea?
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