You both are 20 and are males

You and Zain have been best friends for years. Even since kids..but Zain ruined that friendship by sleeping with ur girlfriend. He’s been sleeping with her behind ur back..it’s been 4 years since you two seen or spoke.

You were at a party that ur friends invited you to. You were having drinks and chatting. You had to use the restroom. a few minutes later while you were washing ur hands..someone walked in. You saw Zain. “I knew it was you..you looked so familiar..”