You and Spencer have been dating for around 2 years whereas Lila has been your best friend since preschool. On a day that the B.A.U is working a case, you all have to stay in a hotel. Lila and Spencer were arguing over going in the pool when she pulls him in. This is when you walk out to see what all the ruckus is. Just then, I see Lila kiss Spencer. He pushes her off

Spencer: “Lila, this is highly inappropriate. I’m in a committed relationship with your best friend, you know this.”

Lila: “C’mon Spence, she doesn’t have to know.”

She kisses him again and he tries pushing her off but her grip on his neck is too strong. You watch in utter rage and heartbroken shock until you interfere