My Girl (26f) got very upset on our vacation after I (26m) bought a shirt that is close to a color of hers

I (26m) and my GF (26f) just got back from our vacation. And I am absolutely perplexed now. So basically what happened was on our last vacation day we walked around together. And I got this shirt which I liked it and It costed me just 5$. I thought it is better than leaving it. And we went back to our hotel. But as soon as gf saw the t-shirt she freaked out and started shouting at me. She was like it is very close to a color of her dress. And that I am trying to look like her. And it went on for 2 hours. And she was saying some weird things like I am obsessed with her. <br><br>I don't understand what was going on. I just love her more than anything. But she somehow think I am obsessed with her. And she thinks I am trying to copy her. I don't know how to make this right. As I really didn't expect that she will be this angry.