I don’t see this as a simple case of advising OP to adopt the attitude “He hurt me, so I’ll drop him. And I’ll drop anyone and everyone who hurts me.” I don’t do that nor do I know anyone else who does that.
I read his rant several times (also the LAME comment...another insult). I find it not only insulting, but presumptuous and a bit disturbing. I see him as a manipulative bully.
If she can overlook it, if she is getting a lot of positive things from the friendship, and if this was an aberration, maybe she should give him another chance. However, I don’t see it that way, (I think there will be more problems), and I would stop justifying my life to him and cease contact with him. As far as "being alone", it's a huge world online and off, (OP has other friends) and she can make/maintain more friendships without putting up with this garbage.