Wow - I missed this one somehow!
My 2 cents: I think that sometimes pain in a relationship, or even in anything, gives us a greater appreciation for the good things that happen. Pain can also make us stronger.
If our lives were always filled with happy-happy days, then we will never be prepared for when something bad happens. It's kind of lie an immunization, I guess.
As to the question of whether to seek out relationships or remin alone; that totally depends on the individual. I have several friends that have decided to remain single, for one reason or another. They don't want a romantic relationship - and not because they have been hurt.
Some of us need to have others around. I for one gain strength from my husband and family.