When someone I respect or whose relationship I care about does something against me, I usually go through three phases.
The first is sadness. So strong that even if I believe I did nothing wrong, I try to understand and reach out.
At that point, if things do not get resolved, anger kicks in. Either towards myself for not understanding, or towards the person for how they are behaving with me.
Then comes indifference. It is comforting and irreversible. This person is erased from my life and esteem, and I move on.

Today I have reached the third phase with someone I tried to clear things up with for a while, in vain.
And now, relaxation reigns supreme.