Before you decide to leave...

I've been there before, it has happened more than once and I hate the feeling of everything "pent up" so what I began doing, was lists/notes. Sometimes I email them to him sometimes I print them and bring them, and he or I will read it and go through it

It helps me stay focused on what I want to discuss and helps him know where to take the journey. I'd consider trying this especially since you like him a lot

Good luck