There's no need to rush into marriage right out of college. If she's the "one" then continue to date her for a few years after you graduate. After that time you'll both have become intimately familiar with the realities of airline life, and can consider the plunge then.
Maybe 2/3 of the airline couples I know are still together but it definitely takes sacrifice. One example: Wife quit her legacy to take a job with her husband's legacy. Now several years later they're both living in base, she's a sim instructor, he stays on the most junior aircraft for QOL, they have a part time nanny for the kids, and probably have a household income of a half million a year. Power couple!