I don't understand a thing

I can't imagine being with you,
Neither being without you,
For the rest of my life.

I can't imagine falling in love,
With another guy,
Someone else like you.

I can't imagine letting you go,
And being all alone,
Every day and night.

I can't understand why I'm doubting,
About us,
All the time.

I can't understand why true love ends,
More and more often,
I'm scared to lose you to.

But I do understand why I love you,
Why I love you with all my heart,
That's all that matters!