What defines love?

It's viewed differently when compared to every other person.
I could say love is an intimate feeling.
While you could persist that it's non-existent.

What does love really mean?

I believe love means you're willing to devote your life to a certain person.
It's an intimate feeling - but it comes with stress and fear.
But you can rest easy if you know the other party involved loves you too.

What does it mean if you don't love someone enough?

Is that a real thing?
Because I tried my hardest.
But it wasn't enough.