Me (29f) and my boyfriends (34m) relationship is far too gone?

We've been together for 7 months as of now and I'm not sure I can see a future with this person.

We knew each other a little before we started dating. 1 Month into our relationship I got myself an apartment and he helped me out with carrying furniture and things. We decided we would try to live together for 1 week so he brought some of his stuff to my place. Fast forward and and today, we are still living together at my place. He told me half a year ago I would get his apartment key as well, but I still haven't since he only has 1 extra spare key.

The first three months together were really good and we had a great time together. He confessed he loved me and I did as well. He was so sweet and caring for me. But after this ''honeymoon phase'' things have turned out for the worse.

We where drinking one night and we started talking about everything and after a conversation about our exes, he said: ''If I could, I knew I could take my ex back''. Which I replied with what the hell are you even saying? He aplogozied, saying of course he wouldn't be able to because he's with me because he loves me.

It was a little hard to accept what he had said and I ended up talking to a guy friend about this and he was very supportive. My boyfriend knew this and told me that my guy friend only wants to talk to me because he probably likes me, waiting for our relationship to end so he could take his chance at me. However, those words he said kept nagging in my head for about two months, until I decied to forget about it.

He had access to my phone code because I didn't care about him having it, he have also helped me look things up on my phone If I weren't able to (for example; me driving).
I never got access to his phone as he said ''I don't find it healthy in a relationship to have access to each other's phones).

Our recent argument was before new years eve. I was browsing my phone beside him and he suddenly took it out of my hand, starting to use it. I reacted with reaching out to him and take it back (I have nothing to hide but he has never taken my phone out of the blue before, in which why I think I reacted that way). He said I have something to hide from him and I said no.

He insisted he was right and would believe I had something to hide. That night, we ended up in another argument, in which he ended up calling me stupid and slamming my front door so hard that my neighbhours might've have heard it.

Our intimate life is nowhere to be seen these past two months. We've talked about it and he said it's because it's been up and down between us in which he's not getting so turned on lately but that he misses our sex life as well, so we were going to try work things out.

I've tried to take initiative and be sexy. He's response has been ''I'm too full. I'm too tired. It doesn't feel good right now'' So recently I'm starting to feel unattractive to him since he has never been like this before.

He has also started to use amphetamine more reguarly. (He told me beforehand he uses it 1-2 times a month) and I've been okay with that. I however, do not use any drugs.

I knew he had some benzo pills in a container in his pocket because he was supposed to take it on new years eve to help him sleep.

One week ago, we were hanging out and he asked if he could take amphetamine and I said ok.
That night we drank some alcohol and stayed up late. When I woke up that morning, I found that container which he had stored benzo inside it, on the floor and it was empty.

I asked him several questions like ''Have you only taken your regular sleeping pills?'' ''Yes'', he answered. I asked again: ''So nothing else, only those?'' Which he replied with: ''Yes only my regular pills''.

I showed him the empty container and asked him about it.

''Oh right, I forgot to mention that. I took benzo as well, I hardly even remember it''

I felt weird about it but said that he must've been very drunk or something to forgot taking benzo.

Later that night he confessed to me: ''This is the first time I've lied to you but yes, I remember exactly that I took benzo. I just can't have you think I'm a person who takes drug without even myself knowing it''.

I told him that he didn't have to lie about it, because why? It doesn't make sense.

His reply to that was ''I felt like I was being interrogated that morning, that's why I lied to you. You could've straight up asked me If I had taken benzo or not''.

I said I hope you're not shifting the blame onto me for your lying, because I won't take that shit. He said that he's not shifting the blame on me, but that I should somehow understand how he felt interrogated about the whole thing.

Somehow I still feel deeply for him but our relationship is clearly unhealthy. Dear reddit users, what is your thoughts about this?