My friends act like real jerks-Like yesterday..?

Last night my gf was so tired she fell asleep on my bed in her red dress at like 7 pm and my frends came over(I should mention one of them is her ex)And my Gf came down and she just says hi and I notice she and her ex were just looking at each other until my other friend elbowed her ex. And they both snapped out of it. She then asked if any of us wanted anything 2 drink then went into the kitchen to get it. Her ex followed her and he whispered something to her and my frend says to me ""he's trying to make a move!" and then we hear someone drop a gl- my gf- and then say "you wat?" very loudly. She then comes into the living room and grabs her sweater and opens the door and she says "jake outside plz just 1 sec" I just say ok and come outside. I hear one of my frends go "oooo" and I just rolled my eyes and closed the door & I say "wats up?"she's like "ur frend is a jerk!" "who?" "peter!" (not her ex) and then she's quiet and she says I'm leaving. I say ok and kiss her goodnight and walk inside. Then I ask her ex wat he said and he wouldn't say. What do you think he said?