Ouch! I sorry that he let you down and that you did not get what you needed from him. He clearly dropped the ball.

I do not know what was happening in his personal life. Although he really hurt your feelings, try to not jump to conclusions by thinking that he does not care about you. Any number of things could have happened. The reality is that there is no reason that we can accept (illness, family tragedy, etc.) that makes it okay for our Ts to slip up. He acknowledged that he was extra bad for not scheduling your session and for that, he gets a cyber slap. There is really nothing more that can be done so please don't let this rupture your relationship.You don't have to pretend that he cares about you because he has shown it in other ways. He just screwed up this time.