I have been Tyler's FP (i know because he told me directly) for roughly 2 years. It's not a healthy friendship and it's completely one-sided. I can't do it anymore. But I feel responsible for him and I'm so scared if I leave him he will **(!** **TW !)** unalive himself. I was really young (F18) when I met him so there are no boundaries in our friendship. I came to this subreddit because I don't want to hurt him and I want to make it as easy as possible for him. 

I don't feel comfortable doing this in person so it will be over text. The goal is to not have any contact with him in the end but in order to achieve that in the safest way do I:

Set firm boundaries and then because I wont be in contact with him often (boundaries), slowly drift away?

Send a long 'i cant do this anymore text' and completely cut him off?

Set firm boundaries then in a month send the 'i cant do this anymore' text?

None of the above? A combination of the above? Literally any comments/information would be so helpful. I already feel SO guilty about this so please no mean comments.