So probably more of an AIBU but don't have the rhino skin for the replies.
In my late teens/early 20's I had a male friend; probably I now know as the best friend I would ever meet. He was the funniest kindest genuine person I ever met.
For me it was totally platonic; maybe young and foolish.
After some years he emigrated and we lost touch, that was over 20 years ago.
Other friends mentioned after he left; it was because he actually had unrequited feelings for me and needed to get away 
So he has popped up on my social media as a friend of a friend etc.
Today I'm marrried, kids mortgage the whole shebang. I'm not looking for a relationship with this man. But I do want my friend back.
Am I selfish to send a friend request knowing I want to only be his friend and possibly cause him pain he doesn't deserve?