"Back off. You're too close for comfort." The signals are pretty
obvious.
Some girls have boyfriends, and they have other male friends. The
latter are just friends to keep them company when the boyfriend is
busy, when they need opinions from another male perspective on
certain matters, or when they just simply need a listening ear.
Read some of the posts in this forum, you may understand more from
their experiences.
She is not the only pebble on the beach.