I think I have done in my current relationship (softie), but if that were to break up and I never found it again, I think it'd always bother me unless I was distracted. I'd end up throwing myself into full time work, 24x7 near enough so I can progress further in a career without the distractions of love and children and all that jazz.

Sounds a bit sad but it's honestly how I'd think of going if I wasn't married in the next 10 years.