You should've did what a friend of mine did with his friend (let's just call them Wingus and Dingus for lack of confusion).
Wingus saw a hot girl at the park one day, so he got Dingus to help him pick her up. Dingus was going to pretend to steal her purse so Wingus could act the hero. Unfortunately, once Dingus took the purse, the girl chased after him and beat the shit out of him. Wingus ran up to them, laughed at Dingus and told the girl "that was pretty hot. Wanna go out?" The girl accepted, and they had sex and she spent the night at his place.
In the morning, the girl saw a picture of Wingus and Dingus on the shelf, and she questioned Wingus' motives and asked if she knew the guy in the park. Feeling bad, Wingus spilled the beans on everything - the plan, his friendship, and so on. The girl nodded, then punched Wingus in the jaw and left. Wingus called up Dingus, and they had a good laugh.
Now what have you learned from this?