Hello, I'm new here (obviously) but I'm looking for some advice and perspective on my fiancés steroid use. (TL;DR at the end... Fair warning/sorry for the essay)

For some background, we have been together 3 years, engaged for 1, and our wedding is in 2ish weeks. We have always been great together, rarely fight, fulfilled, etc. About a year and a half ago, he decided to train for a physique competition, and I was fully supportive (we work out together a lot, nothing new for us other than improving diet lol) but I told him "as long as you don't take steroids that's fine." Well a few months later I found some pills of his with a fakey label and I confronted him and he said "yeah it's stupid, I don't know why I took them, it's not healthy etc etc"

Fast forward to a week ago: We got in a huge fight, he claims he's just starting to stand up for himself and he's sick of my bullshit, I admitted where I was wrong and realized my mistakes and am working to understand how to fix everything. His attitude is like nothing I have ever seen in him before. He used to be very patient, understanding, supportive, caring, thoughtful, and now he's much more self centered and doesn't even think of my feelings at all, or care if I express them. I can't even have a productive discussion with him because he immediately gets extremely defensive and hostile, and there's not much I can say that will get a decent reaction. When he's not mad, he's just stupid horny and like off the chain energetic with this major bro attitude.

I know he's been taking steroids again, I'm not sure for how long though. He is under Doctor supervision, getting blood tests, etc. so I know he's trying to be healthy and smart about it. He also has all the supplements that help support the natural function and estrogen blockers. I asked him about if he was using them again, and at first he ignored the question. I found his needles and asked him again. He said that was for all the stuff the doctor prescribed him, showed me the prescriptions, told me it was just to help him get to normal hormone levels. I believed him but then found a whole bag he has of legit steroids. I asked him what was in the bag, he said it was for his friend. I believed him. Today, I checked the bag again and found that it was all still there, just emptier... So I assume it's not actually for his friend. He has tren (which I found searches for on his computer), clen, and who knows what else. But seems to be a lot based on the research I have done.

Now, I told him I know he does steroids and I want to understand it and I'm not necessarily opposed to it, I'm just worried and want to know his side of the research he has done. He still denies it. I legit found his gear and he still denies it. I told him I want to get on the same page and he still denies it.

I'm worried because in the past year and a half, he got a massive infection (from injecting) and had to have surgery with a week in the hospital, and he has been to the hospital twice for heart problems which I know steroids have some affect on. I'm also feeling betrayed because of the lie but even more so because we have a lot of expenses, both of us work commission based jobs and I'm always stressed about money - and here he is spending literally hundreds or thousands of dollars on steroids. Like he drained a savings account and pretends to not know what all those withdrawals were for.

TL;DR my fiancé is taking steroids, seems to have health problems associated with and/or exacerbated by them and his whole attitude and personality have changed. He lies about it and takes money from us (money that we really can't afford to spend).

I don't want to give up on us because I really miss what we used to be and I know this is changing him. I want to know if anyone else has experienced this, or has advice on how I can have an open conversation with him. Again, I'm not some anti-steroid crazy person, I'm just concerned for our future and I can't handle the lies. Has anyone quit taking steroids to save a relationship? If you have quit taking them, what made you decide to do it? I'm not going to tell him what to do, I want him to do what's best for US, not just for him.