We all get annoyed- at friends, family, coworkers, and those we are dating (or ahve dated) in the past. Unresolved emotions can lead to resentment.
They can also influence how we interact with future partners AND the level of compassion we hold for ourselves.
Emotional Freedom Techniques (EFT Tapping) is a great way to change your brain patterns around the emotions you feel. And, to let go permanently.
You have videos on how to do this well in your classroom. And, tap along with this video, saying the same words while thinking of your situation. Replay it as many times as you need to find relief.