I don’t want to be the spiteful “Baby Momma”

Hate that baby momma word btw.

Anyway, honest opinions please or advice.

I have 2 kids with my ex, long story short we have a long history of him being abusive, drinking, and his drug use.

We separated over all this, and currently he gets the kids every other weekend. It’s been 9 months or so and he’s been okay with the kids. You know I thought he was.

Previous time he had them, I found out he was outside his home drinking and partying while they were inside his mothers house, to my knowledge his mother was sleeping. I was angry, still am.

Gave him another chance. Fast forward to this weekend, I see on snap from mutual friends that he is partying again, but has multiple people men and women their while my kids are alone inside. I drove 2 hours at 2 am to go pick them up.

I feel like I am not over reacting, is it wrong for me to keep the kids from him tell he grows up. Takes random drug test and is supervised? I do not care what he does in his own time. I just want him to not put my girls at risk.

Is it right to keep them from him until he’s more responsible or am I overreacting?

Update:

Thank you all ladies for taking the time to comment.

He currently is on probation due to traffic violation and had drugs on him. Enough proof? I also have photos of the drugs when I found them and videos and text messages of him admitting to me he was on drugs basically the whole time we were together. He’s never abused our kids though thought I should state that. But can sometimes be negligent when it comes to being responsible. So my question is when it’s his weekend comes , up can I still keep them or do I take the chance and send them?