Ex spouses could be friends. I am friendly with mine. I am not sure that’s what you are doing though.

No harm in getting back together of being friends. But are you doing it because he is a kind, trustworthy, stable, independent, honorable man or you want to be together because you felt all excited and all kind of sparks seeing him in a bar drinking dancing and probably being high (not saying you were but he sure was).

Partying in bars is fun but it’s not real life. Real life is you two having constant fights, him constantly lying, him doing drugs, him asking you for money, constant drama, you are being perpetually upset. That’s sadly is a real life you have with this man. If that’s the life you want, that’s the life you’ll have

But of course you are free to do what you want.