did i do a bad thingg?

i was at my schools football game and i was with this kid that i really like and were flirting majorly with each other and we were playing the nervous game and stuff and like we were telling everyone that we were brother and sister and i kissed him on his cheek and one of his friends saw and told his girlfriend and she isnt talking to him and hes all sad and stuff and saying he is going to die if she breaks up with him but i keep saying im sorry and he keeps telling me to quit worrying...