But, noone is obliged to like some even if they're the best out of all humanity. Though tj probably already did, at least an inkling of it.
Also, tj wasn't sure MC liked him. He suspected it but wasn't sure. Noone could be if the other party does nothing to prove it. Plus, there was never anything inappropriate in the relationship in the past, no boundary crossing, no ill encouragements either, so... Not sure what tj could/should have done

Ml is so shitty
"I like that you're loyal and kind, but not enough for me to like you back. So instead of rejecting you or maybe talk to you about it and put a proper boundaries between us, watch me date a lot of people while also gripping your shirt so I won't lose you. Lol"
Chasing arc better be good