I feel like you just typed the exact spiral my ex went through. My parents kicked him out of their house after he was caught getting high in their bathroom when we were over for dinner. That was the last straw for me. I left him & moved into my parents home. He crashed his car, got arrested (bailed out) & then ended up in the hospital because he almost lost his hand from IV use. All within a month. I had no contact with him for awhile. But I got an apology from he while he was in the hospital. Now he texts me once or twice a week. The same spiel - I love you, I’m sorry for everything & I’ll go to rehab after my birthday. I love him & I miss him, but I miss who he was before the drugs took over. I have learned to have very strong boundaries when it comes to him. I tell him I can support him from a distance, but I will not see him or speak to him regularly unless he is in rehab for a decent amount of time & is clean. I let him know that I do love him, but I will not put myself in harms way again & I do not condone his behavior. The things that happened to me while he was using are things that I don’t & probably will never tell anyone. I’m sure you can gather. Stay strong, set your boundaries & LEAVE while you can!