Tell me about a time you held a grudge against someone. Was it over something serious or was it something petty? How long did you hold this grudge? Do you still hold it to this day?

This must be about school work your parents are forcing you to do
Must be in 2 sentences

I held a grudge against my classmate for not contributing equally to a group project in school. It lasted for a few weeks until we eventually reconciled and I realized it was a petty issue not worth holding onto.