We thought he was a nice person

Most recently, a close friend and I had our eyes opened to someone who was supposed to be our friend. In particular, my close friend was "Best friends" with this person. In the last 6 months, both of us noticed him acting strangely towards us as well as other people.

1. In December, he originally invited us to celebrate his birthday before cancelling that invite hours later. A few weeks later, this "Friend" called me up and told me that he invited 10 other people, stating he wanted the event to be small. Meanwhile, neither of us were included. When I confronted him, he appeared to apologize.
2. Then when it came time for my friend's birthday, this "Friend" changed his story three times about why he could not join us to go see a movie and do dinner afterwards. He even texted him to say he was sorry he could not make it,
3. Then the day after my friend caught him posing for photos with another buddy of his, appearing to be going to same movie together

At that point, my friend was fed up with him and decided to unfriend him on social media which led to some very nasty backlash

1. My friend got a message from this guy who

A. Asked him why

B. He told my friend he was being mean

C. When my friend attempted to tell him that he has too many other friends, this guy got upset and blocked my him.

2. His buddy, who he saw, the movie with, evidently attacked my friend by accusing him of..

A. Having a fit because "His friend" lots of other friends and therefore was taking his anger out on them, including this buddy/

B. His buddy also explained to him that his "Friend" told him that I am a negative influence.

C. His buddy also told him that he doesn't want my friend going to his socials at his house anymore

Believe me, my close friend and I are both very hurt that they would pull this on us.