You were the significant other who used to be the sidechick, thinking the cheating cycle would end with you. Well, WRONG. Eventually finding out they've been cheating for awhile now, you wanted revenge. So, you called up their ex, who agreed to meet up at a cafe.

Timeskip to said cafe: you were face to face with the man you helped get cheated on. Great.

"So you're the nobody they cheated on me with." he blurted out