[ Singles & Dating ] Open Question : I feel bad for doing this.? (boyz ,girlz)?

Ok so this is how it went down. My friend justin likes this girl name christina. I went up to christina and started flirting with her and kissing her infront of justin and grabbed her butt and held the middle finger up at him. He was crying. He is shy and never had the guts to do it. Besdies i think she like it lol. Should i do it again?