I can only speak for myself (and I apologize to those who have read my thoughts before about this) but I lean toward the thought of believing it can be better to have never loved than to have the great love of your life and then lose it, depending on the situation.
I heard the song "All At Once" by Whitney Houston on the radio the other day. This song sums up a lot of how love was for me, "All at once, the smile that used to greet me... Brightened someone else's day. She took your smile away... and left me with just memories... all at once."
The problem for me is that I had this one time in my life that was so intense, both good and bad, that I now have a fear that this was my only shot, lost to someone else, and will never occur again. And it's a really terrible feeling.
I know this will be somewhat controversial but it's kind of like sex. Would a person rather have an experience that made you feel like you were really missing something (in a Godly context, let's say a marriage that ended in the death of a spouse) or just not have any experience at all?
I know this is a bit cynical (but that's just the kind of mood I've been in lately--my ex-wedding anniversary is coming up soon) but in many ways, love, to me, has been kind of like one of those death traps from the Saw movies...
It feels like you lose something vital no matter which way life goes, but we trust God that He has something greater in the end.