That is incredibly difficult. I had a difficult session with my T when some people had called in the middle of my session and she took it. Then made several other phone calls and was in on a short call conference while it was my time. I was LIVID, well really, I was hurt. Dealing with my trauma issues then having the phone interrupt and having her excuse herself again later to do a conference call was infuriating to me. I told her later how upset I was - that I felt like a side thought. She was not hearing me at all that whole session, her mind was on the man who had an emergency the night before. She said that was "fair enough" and that I simply had to remember she was human, and her clients are human, and they too have emergencies.
I was mad, I didn't want her to be human, not during my session, not during that moment it took me so long to get the guts to disclose some of that trauma. But in the end, I looked at all of the things we've been through, and all of the things she's given me, and how I can indeed forgive her for being human.
It's not easy, but, it happens.