Teehee, men trying to draw concusions as to why women do things that they do :3
When I have a gf, and I love her, I (out of respect) don't talk to other women if they like me.
The female species thinks and worries about everything, you will only push her away.
This isn't true. :P It's actually kinda lame.
:3 My advice to you is, put yourself in her position. Say theres some guy of equal attractiveness as you are that has a thing for your girl, but she claims to only like him as a friend. Would it be bothersome to you if she continued to spend time with him?
I don't think being friends with someone with a crush on you while you're dating is a problem at all as long as you're honest and make sure she knows you are in a committed relationship and entirely uninterested in being unfaithful and/or leaving her for another girl. If she tries to get up close and personal, make her stop and reassure her again that you aren't interested in that sort of thing until she does get it.
It would also help to tell your own girlfriend exactly how you feel about the friend and reassure her you fully intend on being faithful. Sometimes a little jealousy is nice to make you feel wanted, but if it gets excessive or obsessive let her know it's becoming an undesired quality and she has no reason to be jealous.
C: Thanks for writing to Addy'd Advice Column! :D