My argument with my ex

The biggest argument I ever had or at least the worst I know, is an argument with my ex. We argued on Valentine's Day, this was during 2016. One Valentine's Day I took her to the carnival and I went on the rides with her and won her prizes. Then later on Valentine's Day I took her to the movies. I forgot what movie, I think a scary movie I'm not 100% sure. But now let's talk about the angry part, so here's why we argued. She was mad at me I didn't get her a "gift" gift, the reason why I didn't is because I spent most of my money on the carnival and movie. While we were arguing I brought up something that happened not that long ago that she thinks I didn't know,  it was that she kissed another boy. I was mad at the time so I stopped the argument, took her home, broke up, and went to bed. The worst part of the argument was that I didn't get to finish my Icee.