Honestly gaslighting like that is disgusting to get someone's hopes up like that only to find out she has a BF. A girl was doing that to me, and now I have a hard time trusting people anymore.
Because 99 times out of 100 that isn't the case, it's almost always men who cannot fathom interaction between men and women outside of familial and potential mates.
Again, what about gender makes that okay/not okay?
Edit: poor communication goes both ways here. It's bad to lead someone on if your not going to follow through with it. It's also not okay to try to be friends with them to fuck them.
We can do this without enforcing gender stereotypes.