Holding grudges hurts you more than it hurts the other person. It's best to forgive and forget.
#redsquirrelinspirationalthoughts
Seriously though, if someone is causing you any kind of stress or hate it's easier to just escape that situation instead of trying to fight it and continuously hating that person and holding a grudge. You have to leave that situation so it stops affecting you, and then let go of the grudge. Easier said than done sometimes though.