Why would a “close” guy friend all together cut me off out of the blue?

Anonymous
My “close” (ig “ex”) best guy friend has randomly cut me off all together like when we see each other we don’t say anything to each other, he avoids eye contact and looks down. I tried planning for us to hang out but he ended up bailing on me... when HE rescheduled for us to meetup and hang out/catch up (i planned to bail too likewise) he still managed to BAIL on me (after he said to me the day before ‘don’t worry I haven’t forgotten about you’) again just to find him an hour AFTER we were supposed to meet up and he was with his frat brothers at the place we were supposed to meet up at. Today, he had BLATANTLY ignored/acted like he didn’t see me even though we made eye contact for a brief second and he walked past me, his facial expression changed to looking sad/disappointed like he was upset with me. I haven’t spent much time with him in awhile though so I don’t know exactly why he’d be mad at me... Things were okay between us before I went to a party with another guy friend that I kind of expressed interest in and I personally BELIEVE his female friends who saw me at the party told him about me and this other friend being all over each other at that party things/that dynamic between us changed quickly after that. (REMIND YOU THAT THIS FRIEND CURVED ME MONTHS AGO WHEN I MADE A PASS TOWARDS HIM!!!) So now we don’t speak/talk anymore and I don’t know exactly why though... my guess is maybe his ego took a hit or I don't know but it’s a MASSIVE change because we were good a week before the party and after the party things changed where he’s now dodging/avoiding me... I am confused and hurt by his actions :’( it’d be nice to get some feedbacks/opinions on this.
Why would a “close” guy friend all together cut me off out of the blue?
3 Opinion