How to tell my bf that i cant always show him my body ? [serious ans only plz]?

It's not a question of hurting him. You were flirting and giving him the signals that it was OK to touch you and then changed your mind. He is confused. Don't say anything for now, but if he goes too far again, tell him that you don't feel comfortable. If he tries to bully you, say that you were wrong to behave that way before. Flirting by a girl is a form of control to guys. Don't do it.