Women do not shed their feelings faster than men. What happened is it's easy to put your ex in a box for a while if you have someone else keeping you occupied. That's why rebounds are so powerful in a breakup. People get rebounds because it makes them feel better for a while. However, usually it is short-lived and the feelings surface again.
The mistake you made is sticking around speaking with her. Go on no contact like the rest of us. By no contact I mean: No texting, no brief phone calls, take her off facebook/myspace(don't look either!), intentionally bumping into her, etc. Do a complete cut off. She WILL wonder what happened. You're making it easy for her by being there. It will hurt, but it will also get better.