It took a while.

We met when we were 18, and I had plans the night he asked me out. (He maintains that he thinks I just blew him off.) We became very good friends through college, then FWB for a while after graduation. We both got into serious relationships for a while, and then
finally got together "for real" when we broke up with our SOs around the same time.
After that, it was pretty obvious that we were meant for each other, and things moved fairly quickly. We're still head over heels after 10 years of marriage.