His name is Leon, he's your boyfriend's best friend.

Lately your boyfriend, Robbie, has been acting weird, and you've seen him hanging out at your friends house. His location is on and so is hers and for the last few weeks, he's been there none stop, barely giving you any attention.

Leon noticed this and took matters in his own hands. He was outside your bedroom and knocked, "You better be decent because I'm coming in"