If you see a future with your current partner, and want to eventually get married, you might be crushed if you were to find out that they don't believe in marriage like you do.
Committing to someone forever seems terrifying to some people. They can commit to a career, to friends, to an entire lifestyle, but to another person? No way.
Maybe you've been with your partner for years and years, or maybe you haven't seen someone exclusive in a long time and are very much single; either way, have you ever thought that maybe you're not meant to get married?