Are men supposed to help women, if the woman is carrying heavy objects?

The other day, this girl at work started moving some boxes around the office, not because they told her but simply to clean the office. I think the boxes were heavy as she was struggling with them. I was on my desk doing my work and she kept staring at me, as if she wanted me to help her. Also, because she was a female, I felt that I should have helped her. At the end, I didn’t because moving boxes is not my job and she decided to move the boxes on her own. I felt guilty about it, mainly because she was a girl and I was taught to always lift and carry stuff for women. I don’t think I would have felt the same if it was a guy.
Are men supposed to help women, if the woman is carrying heavy objects?
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