Will time really heal a broken heart

We wake up one day and fine our lives have changed.
We find we are in love. And we will never be the same.
I found this out, a couple years ago.
That love can be real.
And you never want to let go.
I tell her in time, how I truly feel.
And hold out my heart for everyone to see.
But I waited too long.
She loves someone else.
Now I just seem to cry, and feel nothing but despair and guilt.
For me it is a living hell.
I know what I want.
It is so powerful, I can’t get it off my mind
The days seem to go on forever.
One the same as the other.
My gosh I love her. And I can’t walk away.
I keep my hopes up, that things will change someday.
I dream of to much, and I know it will not be true.
Am I crazy, or just a fool.
My heart is broken, seeing her in his arms.
The kisses he is getting are what I crave.
Knowing he is making love to her is putting me in my grave.
I know this could be so right. I could be who she needs.
All I want is for her to love me, not having that is killing me.
In my arms is where she belongs.
Anywhere but there is just wrong.
How do I get past the feelings I have.
Should I give up?
Should I fight?
Someone tell me what is right.
This broken heart, is pain I cant take.
Will time heal the pain, of knowing I was too late?
Or will I live, knowing I missed out on something great.