pos husband

I have just walked in the bathroom last night on my husband shooting up.  I should be devastated and emotional but honestly I'm hardened to this crap by now. We have fought for 4 years to try to get him clean, and a couple of months ago, I was led to believe he had finished methadone treatment and was clean. I feel like a complete dumbass.  Come to find out he has never been off of it. He has been working extra at work for cash to pay the $90 a week that we can't afford so that I wouldn't see the money come out of the bank account. He let me buy him a $100 gift for completing methadone treatment knowing we were spending $100 a week on him still and I am going without a birthday present so that our 8 month old son can have a Halloween costume. I just kicked him out of the house, I know he's a piece of shit. I just don't know whether or not to give him one more thousandth chance now that we have a baby. Things are so different now and more complicated. I have no feelings for him anymore, but I don't believe in divorce. I don't believe in having a dope head in my house with my baby even more so... I have some hard choices to make 😔