Drug addicted ex

My ex bf has told me for years he's going to get clean. He came over the day before my birthday high on pills.I left him stay for a couple hours.he still says he loves me. But I'm not getting involved with that train wreck. My kids don't need to him like that either. (When he had me as his gf he should not have cheated and should have changed his ways. Way past the point of no return) I'm not given a drug addict a place to live. Not going to be a enabler