You've been realizing that Dave has been acting strange, he's only hanging out with you. If you're in a conversation with someone he'll interrupt to try to push you away from whoever you were talking to. Earlier today Peter told you about how Dave was threatening him so you decided to ask Dave about it. You walked in on him the back office, Dave jumped in shock at seeing you

"Oh! Heya Old Sport! Didn't expect you to come in here. Were you looking for little old me?"

He teased jokingly