This boy at school has been flirting with me and I have been flirting back a little ( he's kinda cute not gonna lie) but the other day he came up behind me and pinched my butt which surprised me so I was like want a hug? and I acted like I was going to hug him and kneed him in the nuts.(not hard but it still looked like it hurt) after he text me and was sending laughing but should I apologize? I don't want him to stop liking me honestly