If I had to choose, I'd rather have loved and lost.
I'm in love now, and before I met this girl I really didn't know anything about love.
I've done some awesome things. Some stupid things too, but mostly good things. I'm not going to rant, but seriously, my girlfriend makes me the happiest I've ever been in my entire life.
If I lost her tomorrow, yeah, it'd suck ass. I'd be depressed, I'd flip out and declare that I'd never love again, or something equally dramatic.
If I never loved her, I'd never have had the good times. I wouldn't have the stories to tell my children. I'd have no concept of love.
I'd rather love for a day, then deal with the loss for a thousand years, instead of living for any length of time without ever loving in the first place.
And when I say 'love' I'm not talking about sex. Yeah, that's part of it, but when I say 'love' I mean the whole package, not just 'making love'.