I would be surprised if she was seeing other men. Its almost like an unspoken rule in a situation like that. Personally, i find it hard to get to know someone if im dating a lot of people at once. I was never able to do that. I usually date 1 person and see if we are compatible. If not break things off.
I think whats happening is that the pursuit made you eager to go after her and court her. Now that the challenge is out of the way, your not as excited. If she backed off a bit and was more elusive, i bet you would regain your stronger interest and stop worrying about committment phobia. This is pretty universal though. Its why nicer and more normal drama free girls tend to not get appreciated. They decide to one day bake cookies for you and you dont feel challenged.
Kind of why Archie neglects the hot blond for the spoiled Veronica. It doesnt make sense.
