There won't be much comfort in this, but if you make someone else your entire life and they leave, die, whatever... well... it's fairly logical that your life will cease to exist because it stopped existing long before they left!

I think few couples manage to find the balance of being together and being individuals. There's this mythical romantic notion in the way that being in love with something means they matter more than anything else in the whole world. We (collectively) seem to find the extremes readily:

"I can't live without him/her!"

"Make one false move and your ass is history."

There is a middle ground however difficult it might be to find it.

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Enjoy the journey, not just the destination!