Wear Sweaters.
Even in the summer, fore he can't kiss your skin, you'll miss every kiss, you'll crave every touch. But this way, he cannot tell you how "hot" or "stunning" you look with less clothes on.
2. Wear lipstick.
You won't be able to truly feel his lips, you'll feel the lipstick against his lips, you won't miss it as much if you never had the true kiss.
3. Watch his eyes.
As his ex walks by, watch his eyes. If his eyes follow her, then he hasn't gotten over her. If he looks at you the whole time, then he's moved on.
4. Kiss his neck.
Leave your mark the night before you tell him you found out, that way for at least a week his friends will ask where he got that hickie, his mind will go straight to you and the night you spent together.
5. Don't open up.
Don't tell all your secrets to a bad boy smoking his last cigarette as he holds you to his chest, he doesn't want to know the truth, and you shouldn't tell him. If you do, twist it a little so he can't hurt you with it when he does leave, he'll never know the truth and you'll never be hurt by another lie.