Ok Jeremy...here's what you do. You go out and find a goose and...oh wait...that's what I'd do. Scratch that.
Here's the bottom line man. I think we've already established that you're going to be the only one acting like an adult here and as such you're the only one entitled to make adult decisions. If she's going to run away every time shit gets difficult, you're going to have one helluva problem marriage. Every marriage has problems...even the best ones...so it's important to learn how to face those problems head on. If she's unwilling to do that you have no future with her. Sorry man, but there it is. It's a matter of nature that the "newness" and initial excitement will wear off in any relationship...it has to and that's not necessarily bad. But two people who truely love each other will settle into a seperate life that doesn't require that excitement and those are the one who will last.
I'll never understand how you can be with someone for the better part of a decade (or longer in some cases) then just wake up one day and decide to piss it all away. I mean I figure if someone was gonna do that they'd do it pretty early on. Bah...women.