I am a gay dude & I have been on Grindr for many years. In general people are disrespectful & you are treated like you are disposable on Grindr.
I call this the Hook up culture effect.
I can see both sides here.
The way in which this guy has conducted himself stems from insecurity, pain & maybe other issues(im not a qualified professional).
He probably has been stood up a few times, it seems as if he is desperately seeking a relationship or the feeling of being loved.
This way me before therapy. I have abandonment issues & use to seek out relationships to hope of feeling loved. Therapy has helped me identify this as unhealthy behaviour & I'm working on myself.
I also feel for the female in this situation. She had a genuine emergency & unfortunately had to reschedule. At least she was honest.
Anyway, I think this bigger than this guy just being an asshole. Men seldom share their feelings & i think this guy is possibly dealing with other stuff.