I made a mistake. I allowed the connection to become intense too quickly now I can’t back out?

I made a mistake. Over the last few months I was really lonely and stressed. I just wanted someone to vent to and listen to me. There was this guy, I knew he kind of liked me. But I just assumed he knew I’d never be with him (I even expressed this from the start). We talked every day for months. I have no romantic or sexual feelings for him at all. So I didn’t realise how dependant he was becoming on me until I started to withdraw.
I realised we can’t be friends (he has extremely almost alarmingly strong feelings for me) and I don’t want to date him. But he won’t even allow the connection to reduce. It is partially my fault because I talked so frequently to him. But he is started to scare me as he has a lot of mental health etc and his mental health has escalated a lot.
I’m trying to find a way to convince him to slowly end this weird friendship and make it feel like it’s his idea too. But if I even hint at this he freaks out. Like really freaks out.
i don’t know how to handle this? Every time I say we can’t be friends. He keeps saying we can we can…and it’s like ah.

I made a mistake. I allowed the connection to become intense too quickly now I can’t back out?
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