For Others or For You?

I took the weekend off and flew down to San Diego to spend some time with my best friends. As I am staying in my friend's apartment, she was packing some of her clothes for me to bring back to the Bay Area in preparation for her move back. She comes out of the room with a pair of heels that she says she only wore once. I asked why she only wore it once and she told me that these heels hurt too