There’s also the possibility that it’s a romance scammer, I’m which case it’s good he’s gone. Don’t give him money or your full identity details :-)

If you’ve never met him, he could be literally anyone living anywhere in the world.

How can you improve your self-esteem at this time? If you’re out at the gym or doing something constructive in the real world you might meet someone or at least be less inclined to give a stranger on the internet the time of day.