Help! TW : drugs in the marriage

I am at my wits end. My husband has been working a lot. We are struggling financially and he has been trying to pick up extra shifts. He has not been home and I noticed some strange behavior. He has a history of drug use and his behavior was similar. Anyways long story short. I asked him to take a test and sure enough positive. Meth. We have 4 kids, over 10 years married, extremely in debt, I am alone. I am numb. He had been clean for many years and last year he used again. He stopped got clean and I let him come back and now he is using again. I don’t want him anymore. He’s not good for us for the kids. But I’m scared. I can’t afford life just me. I am trying to file for bankruptcy but it’s so expensive too! And I am just so scared. Am I wrong for this? I said for better or worst. But this is not ok. My kids don’t deserve this. I don deserve this. I’ve always considered him first but I can’t anymore. Am I wrong?