My work-friend cut me off completely after I set a boundary

Hey guys. Long time listener and reader, first time poster, but I just really need some advice. I feel like I'm going insane, and I'm not sure if this is on me or not.

I (F29) work a pretty standard office job. If I were a Ken from Barbie, my job would be computer. It's a pretty large corporate company where a lot of people come in and out, and I have over a hundred coworkers just in this location alone. I've worked here for quite a long time, so with the many people coming in and out, there's a small group of us that have been here for a while that tend to stick together.

I've been working with a coworker (M mid 30's), calling him Ethan for privacy's sake, for a couple of years now and we've been very friendly. We've gone out to have lunch together a few times, or gotten drinks after work, and we usually set next to each other during work. Ethan is a very extroverted person, but doesn't have any friends outside of work. He's confided in me at times about how he deals with a lot of loneliness and depression because of it. Personally, I'm a very private person. While I have plenty of friends and I'm in a long term relationship, I'm very reserved about who I let into my close personal life. Work friends are cool, but I'm not interested in much outside of the workplace unless we really have a rare click. Hope that makes sense. (He's also confided in me about how there's a coworker of ours that he's really into, but she's said no, and he keeps making advances on her. I've told him to leave her alone, but he's kept being weirdly obsessed with her but other wise left her alone (as far as I'm aware).)

See, I really feel for Ethan's situation and I wish I could do more for him, but respectfully, I can't fix this issue for him. He goes clubbing most weekends, and I know he uses quite heavy substances when he does. I want nothing to do with this, and he knows that. Despite this, he's been texting me at all hours of the night when he's under the influence sometimes. I've told him I don't want this.

So, with context down, here's what happened. A few months ago he texted me another one of his extremely deep confessional texts about the state of his mental health in the middle of the night, talking about how lonely he is and how his mental health is in an awful state. He's a coworker of mine, I don't need them to get this overly familiar with me. Maybe that's where I'm an asshole. But this is a boundary for me. I texted him back in the morning telling him the following (translated, I don't live in an English speaking country): "Hey Ethan, I'm really sorry about that. That really sucks, and I hope you can find a solution for this soon. It might be a good idea to talk to a therapist about this. Take care!"

I didn't hear back from him, and following that text, Ethan stopped showing up at the office. I'd texted him the next week saying I hadn't seen him, and asked if he was okay, and got no response. I was really worried maybe he'd done something to hurt himself, so I asked around the office to see if anyone else had heard from him and apparently he'd taken the time off. Not a bad idea. I did notice, however, that when I asked a coworker we're both friendly with and he showed me their text conversation that Ethan's profile picture was still visible. It wasn't in my phone. He's blocked me.

It took a month or so for Ethan to show up at work again, and when he did, he treated me like I was AIR. Ignored me completely, while we're usually friendly. I figured I'd give him some space, but throughout the week this KEPT happening. So, I went up to his desk and asked him if he's okay. He said he doesn't want to talk right now. I respect that, and backed off. Still, nothing changed as time passed. See, Ethan is my performance coach at work, so eventually we're going to have to meet for work reasons. I've gone up to management to explain the situation and that it's going to be mad awkward to have him be my performance coach like this, and they agreed. And they advised me to go talk to him and see if we can talk this out. So, I tried again. Went up to his desk and asked if we can talk. He once again says he doesn't want to talk to me. I had no choice but to report this back to management, and ask for a different performance coach. This doesn't get him in trouble or anything, just to be clear.

So, Reddit, can you give me some answers? Cause I feel like out of nowhere, I've lost a work friend. Is it wrong for me to want to keep a healthy distance between me and someone I'm arguably not that close with? Especially from someone I have a professional relationship with, I don't need to be texted about your mental health at 4 am 😭