Feeling Insecure when brother buy pads for girlfriend?

So I know this question is very foolish or stupid but still Im taking it a bit different. So my girlfriend's brother buy pads for her and which I didn't like and I got hurt by it (I don't know why but Its my nature probably). Getting hurt like this is normal or different? And please dont blame me Im just trying to understand some stuff. Can I have your respectful opinions on this matter please?

Feeling Insecure when brother buy pads for girlfriend?
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