“By [harboring anger] you are like a man who wants to hit another and picks up a burning ember or excrement in his hand and so first burns himself or makes himself stink.”Visuddhimagga IX, 23
It has a purpose, but if we let anger smolder for too long, it is going to burn us.
Remember two things: First, emotions are there to provide information. Treat them as such and don’t invite them to move in on the first date. Second, anger is never the root of the emotion. Sit with your anger long enough to find out what it is hiding.
Never forget that I love you, and that excludes no one.