Thanks mainly to the Beatles, I always thought that love was all you need. Love was the answer, I knew that for sure. As I’ve said many times and will continue to say, I’ve never loved anyone the way I loved my son Rob and I never will.

I’m sure you feel the same way about your child. That’s the deal when you become a parent—the amount of unconditional love you feel for your children is so enormous and overwhelming that you didn’t and couldn’t possibly have known that you had it in you to give. There’s a transformation that happens at your core when you become responsible for this tiny, new human being who is 100 percent dependent on you.

The world shifts from revolving around yourself to revolving around your child. Your child becomes your world.

But when your world ends, as it has for so many of us, you learn a terrible truth about love, one that the Beatles never sang about. It’s simply this: love isn’t enough to save the person you love.

That insight has become something of a mantra for me. I can’t get it out of my head because for the longest time, I thought it was. I thought love would be enough until Rob, the person I loved, made it very........

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