Coke in his wallet (long post)

Hi ladies... I just need some advice before I do something stupid. Last night my fiancé got super drunk. I’ve only seen him drunk 1 other time before so no, this does not happen often. And I don’t drink because I’m breastfeeding. He drank with his brother at our house. So at some point last night in the midst of all his throwing up and whatnot, the idea popped into my head to look into his new wallet. He just bought this one a couple days ago and when he was changing them, he had pulled out some of the old notes I had written him from his old wallet. So I just wanted to check if he put them into his new wallet and I wanted to read them again. I start looking through his wallet (which I NEVER do) and don’t see them. I fold open the part where you stick your cash and didn’t see anything but happened to see a glimpse of plastic? I look again and was like “oh he probably forgot a piece of plastic in there when he was taking it out of the package”. Well I reach in and pull it out and to my horror it’s cocaine. Instantly my heart drops and I’m so confused. Why is he doing this? Why is he keeping this from me?

A little back story:

My fiancé and I met years ago when we started working at the same place. Somewhere along the way, coke came up and he told me he used to do it pretty often. I asked him if it was something crazy like everyone makes it sound and he explained how it really is. So back then I was a huge stoner and I guess I was down for whatever so next thing I know, we’re planning on doing coke. We do it and one time leads to 3 then 5 and so on and so on. Yes it’s pretty addicting so we were doing it for a while there. We decided to stop because we were wasting all our money on it. I did however start doing it again after we had broke up one time because I was trying to cope and was being a stupid teenager. Again, I stopped after a while. Fast forward to when we get our first apartment, we both hadn’t done it in a while but did it one last time together (or so I thought). After a while of us living in the apartment we start talking about a baby and pretty much start trying. I get pregnant in June 2017. Everything is good, we know we have a baby on the way and we don’t make any mistakes or do anything we did in our past. So along the way of my pregnancy and having our child now, coke and other things have came up and whenever they do my fiancé would always say “we can’t do that anymore we have our baby boy now” and stuff like that. Which by the way I have no interest in doing. So I’m like ok cool we’ve moved on from that bad lifestyle and our priority is our son and our marriage. Well I haven’t even suspected he was doing coke again. I have no idea how long this has been going on. I feel so betrayed and confused. All the trust I had for him is now gone. We’re supposed to get married at the end of this month. I’m having second thoughts. How stupid can he be? We have a baby now! Please ladies, I need advice. He is still asleep and I’m going to confront him when he wakes up.