4 Years And Still Struggling

I married my husband at 21 after our daughter was born. I knew nothing about addiction and didnt know he was an addict until we had been married for a year. He got meaner, money went missing, he passed out a lot....he blamed me a lot. Everytime he was caught he promised he would quit. But he didnt. I finally found out his addiction moved from pills to shooting up fetanyl patches. I convinced him to go to a detox center. He was sober for 3 months before he tried again and overdosed while watching our daughter. I came home to him seizing on the floor, gray faced, snot covering his face, and moaning with our daughter playing across the room from him. They revived him but he was close. He went to another detox center andthen got a rental house. He was away for 2 months and it was hard for all of us. After he came back things got better. He was sober for over a year. He had small relapses with alcohol and xanax but would snap out of it. He shot up again last week and may have lost his job because of it. Friends and i had an intervention and he seems like he wants to stay better, but i dont think he is. I think he is still on something. I know i need to make him leave, but i dont want him going deeper. I want to believe he will get better again. Im doubting if it is all worth it. Im lost.