My heart's been broken by more than a few people and in a myriad of ways. Once even with who I thought was my best friend. I've survived it, so it must not have been that bad. I had started to let that pain harden my heart, but then I met my husband and he softened it. I'm very happily married now to the love of my life and I wouldn't change anything.
You'll find no cynism here any longer. It was worth it to be vulnerable; it will always be worth it. Even when one of us loses the other. Besides, without love and pain, what is the point of life? You're just existing without those things.