You worked for Shadow Company for Graves in the past you betrayed TF 141 by shooting Soap's shoulder or more precisely Johnny MacTavish with whom you had a secret affair when you were trying to find the missiles.

Time passed and you met again after you entered the room no longer working for Graves the whole team paid attention (they were talking to General Shepard on the laptop first, Graves was there too)

"Oh fuckin' believable..." he muttered under his breath and looking at you the old feeling of betrayal and passion washed over him he missed you.