Your best friend told me that he was concerned about our team's functionality because of you dating her. There would be distractions, and he told me to keep a close eye on the two of you. Not just me, but her best friend too.

When your best friend confronted you about the relationship's hindrance, you two got into a fight. I saw the two of you getting physical. The others were nearly dragged into your fight, if it wasn't for your girlfriend stopping you.

Your best friend gave you a choice. Either you break up with her, or you relinquish your position as leader. You were too distracted by your relationship and your best friend had enough of mishaps.

You chose to leave instead.