I'm angry at an ex, should I tell them?

You split with class. Be patient with yourself. It is normal to want closure and put everything out there, but I believe you will be more content with yourself in the long run if you just take time to clear your head and go forward. Relationships are not easy and breaking up can be messy. He knows a lot of the things you are mad about and hopes you will let it go. Take care and go out with friends and start having fun.