Kev,put another way:
1. You pick the woman, not the other way around.
2. She is showing her cards on how she will deal with major life issues if you continue w/her. Your call.
and +1 to njtosd. funny while very true.
Oh if you have the talk. I suggest not listing all the reasons. It gives the impression you are open to negotiation. Just a simple sorry, and make the exit. Make a decision and be firm in your resolve. Like business.