Is it better to have loved and lost then to never have loved at all?

No,

Ignorance is bliss....:D

Yes, the experience is enriching and has an extremely evolutionary impact on the individual.

But it hurts..

:)

Don't know about it being 'enriching' and 'evolutionary',

but it sure can be a roller-coaster ride. ;)

It's the journey, not the destination that matters.

it all depends on your individual outlook on life (and all it entails).....and for some it might be a day to day outlook....

on some days I think...."love stinks" and ignorance is bliss so I wish I'd never met so and so because losing them screwed me over real well

other times when I feel hopeful I think...."yes, so and so and I shared wonderful times and I became a better person (a stronger and wiser person) because of what I learned from them and from our relationship.... (shortly after which I gag from not being used to such "happy" thoughts)

I guess it just varies according to how I want things to "fit"

It is the knowledge from the experience that counts - in this life and perhaps in afterlife...

I agree with Ana, more or less.
But from my personal experience (and in the words of K (MIB)):"try it."