Why would I be encountering mutual attraction with girls that are already in a relationship?

dpy87
I don't try to get involved in others relationship to be clear. Usually what happens is I pickup on girls that show interest through body lamguage but when I ask them out they already have a boyfriend.

The worst thing is I'll see them the next day at school and still catch them staring and playing with their hair! They still are showing signs of interest. Its really such a tease.
Why would I be encountering mutual attraction with girls that are already in a relationship?
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