Found my straight friend-crush on the gay side of Tinder.

A few years ago I was head over heels crushing on a guy I went to school with, we ended up becoming pretty close friends for the remainder of college.For a while I was actually pretty obsessed with him and cried over him a few times, but I was closeted hardcore and to me he was definitely straight and had many heterosexual relationships and sexual encounters in the time I was close with him.I ended up transferring schools to an urban area and sort of losing touch with him (my original school was in my hometown). Only saw him 2 or 3 times in the past 3 years and barely text or talked online. Now I'm back living in my hometown and I suddenly see him on my Tinder. (BTW I didn't know Tinder showed your Facebook friends on Tinder?) It actually gave me a mild anxiety attack and I deleted my entire Tinder account lol. I know if I saw him on there, he probably saw me.Don't know how to proceed from this? I definitely can't bring it up because there's the possibility he was just playing around with Tinder and decided to set himself as gay for a self-esteem boost or curiosity. I know we'll probably see each other with mutual friends in the next few months. Just a confusing situation, and I'll have an anxiety attack when I see him either way, especially because I'm still closeted to most people who aren't in my inner circle.TL;DR: Confused how to handle seeing my allegedly straight friend on gay Tinder, or how to deal with being "outed (not really)" via Tinder.