So I have been with my girlfriend and we hung out all last night till 5 in the morning with 10 other friends and we were having so much fun. But last night she started getting mad because I kissed her in front of her ex. I asked her before I kissed her if it was all right to kiss in front of her ex. So now she is pissed and doesn't want to talk to me or kiss me or anything what the heck should I do?