There could be 100 reasons why somebody wouldn’t hang out. It absolutely doesn’t have to be personal. He could be already dating someone (but he is private about it), he isn’t into dating at the moment, he is busy with others things at the moment, he doesn’t want to hang out with group members because it might be awkward in a group (kind of like dating at work or school). None of those reasons are personal reflections on you or indications of you sunking low.

Honestly I wouldn’t worry about women who go from man to a man. Some do it because they have low standards in men and would go on a date with anyone who asked, and would jump into bed with whoever asked and they fall in love with them all. It’s by no means indication of them being superior to you at all. Most certainly not at all