Planning on breaking up with my bf, scared he'll commit.

Hello, I think the title basically sums up everything, I'm planning on breaking up with my long distance boyfriend of a little more than a year, but I'm very scared he's going to commit suicide and it's been getting in my way of actually doing it.

Context: I f(20) and my bf m(22) are long distance, he lives in the USA and I live in switzerland. We've been kind of falling off lately because our work schedules dont allign, wont for a while and our only method of communication is texting. I could honestly put up with that, but I really have just fallen out of love with him. He's a little unhygienic and plays video games almost 100% of the time hes not at work or sleeping, and I understand those can be symtoms of depression, I'm not trying to diagnose him, but he's recieved help and seems to have no motivation to change. Again, I feel bad for saying this because of his mental health, but when I visited him for a week a while ago he did not shower or brush his teeth eventhough he seemed to be in good spirits, I struggled to breath when he kissed me and it was kind of gross, not really something I have the stability myself to put up with. We used to call and play video games every day, and when we did there were times he let out his anger about certain situations on me, and I feel like those were any semi-high stress situations, again, not something I want to deal with in my future. He kept complaining we didnt do the deed, and that I didnt flash him even though he knows im uncomfortable with that stuff because of SA. I do not like or support his politcal beliefs, he said he changed and I believed him until I heard him say something a little racist, and I do not stand for that shit so I've decided to stop giving him second chances after that.

Now, what worries me is that he owns a gun; he bought it after his mental health started improving after he started dating me. I found this very stupid, but I myself was too stupid to say anything at the time, and he didn't talk to me before the time. Near the start of our relationship, I saw he liked a reel saying something along the lines of "pov: what I'll do if I ever lose this one," and it was a video game character committing with a shotgun. I feel like his mental health is very reliant on me even though I pray that I'm wrong. I don't think he's a good person or someone I want to be in a relationship anymore, it's very draining to me and I have other stuff I want to deal with. He has friends besides me, but they've fallen out of touch, and his closest friend just got a girlfriend himself. I'm sorry this is long, it kind of turned into a rant, I keep telling myself to stop caring because of what he said but at the same time I don't want him to kill himself, does anyone have any advice?