Drug use

I have been living with my fiancé for three years now we dated when we were both teenagers but went our separate ways , we both made our life’s and had kids well we separated from our partners , and life brought us together again at first I was hesitant because all his life he’s been in and out of jail , he said he was a changed man now that he’s older he is wiser well we got engaged and moved in together he is the most amazing step dad my son could ask for very involved in my sons life you would never know that’s not his biological son . Well last May we got into an argument because he got one of his friends that just got out of prison a job were he works , mind you this guy is bad news and to be honest I was scared he was going to drag my fiancé into no good sure enough he was trying to convince my fiancé to quit his job and I let the anger get to me and kicked him out and I know I shouldn’t of escalated to that extreme at that time we lived at my moms because we were saving for a house , well he ended up borrowing his brothers trailer and living there I went to look for him and talked things out tried to convince him to come back home. He didn’t want to unless it was our own home not my moms so the best and quickest solution was to rent an apartment during the waiting period I still lived with my mom but started to notice him different anything irritated him I knew he started using drugs I just didn’t know what drug it was 😔 he would deny it and call me crazy saying I was tripping that he’s not a drug addict he was hardly eating or sleeping started watching porn it was just all bad but we promised this new apartment was a fresh start and it was he changed to being that amazing man again he’s a hard worker and fiancé/stepdad , well on Friday he stopped at his co workers house to drop off the co worker check and I noticed that look in his face again like anger in his eyes he didn’t want to eat dinner he said he didn’t feel good I didn’t think much of it and believed him it was his stomach hurting , well this went on Friday , Saturday, Sunday , Monday , Tuesday I finally asked him are you using drugs ? U hardly eat and you keep drinking again he said it was just his stomach so tonight I decide to pack his lunch and to my surprise I found these baggys in a napkin and flipped out . Woke him up started crying I’m so devastated he had no other option but to admit that he is using and that he started when he lived at the trailer and he quit when we got the apartment and just relapsed again I don’t know what to do I love him but I’m crushed I know crystal is a heavy addictive drug I found the other brown one I’m not sure if it’s heroin I’m not familiar with it I’m just guessing from what I googled anyone that’s been in my shoes please give me advice on what to do or help him 💔