Hello everyone

I am completely new to this forum so please go easy on me! I have a very general question and I hope someone can let me know whether I am just being silly about this or not.

I will do my best to be brief:
I suffer from anger issues, and it has lead me, at times, to be violent. I am getting help for this, and am following DBT, and CBT techniques. I am genuinely doing everything I can do better myself.
My boyfriend betrayed me and we are now going through a process where I have to decide if I can forgive and forget this betrayal.
After I found out about the betrayal, I asked for space, which my boyfriend refused. I therefore got angrier and angrier at not being allowed to think and recover, and so when he spoke to me doing this time, I was very harsh, telling him to shut up and not wanting to hear his explanations. In my opinion I was entitled to space.
I have now been told that his therapist has described my behavior as 'Hitler-esque'.
I find that I am completely offended by this. Not only am I not at all like a genocidal dictator, but I feel like such over the top insults go against all the work I am doing to identify and prevent me 'awfulising' and over-generalising.
It is just really offensive and, in my opinion, really unprofessional.

Am I just being over-sensitive?

Thanks!