Therapists make mistakes sometimes. Haven't you ever forgotten about a coffee date or dentist appointment? Was it malicious? Does it mean that you don't care about that person, it's just a mistake.

I'm sure in the moment that you felt hurt, and you're entitled to feel that. But, I'm not going to condone your reaction. You threw a temper tantrum. That is not a healthy, adult response. You're lucky that you weren't asked to leave.