What does it mean when I was really thoughtful when giving gifts to my ex girlfriend and she just bought me random things I never would use?

So she would tell me what she would want and I would always get that but also I would pay attention to the things she naturally liked and it would reflect in a the gifts for example her last birthday she likes pink and flowers so I found a really nice coach purse and bought that for her. For me she would get random things and then guilt trip me if I didn’t use them also more often then not she would take them and use them herself.

What does it mean when I was really thoughtful when giving gifts to my ex girlfriend and she just bought me random things I never would use?
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