So, this is how I think it could be better written, (remember, this is not the only, or even the best way of writing it, this is just my way of making is clearer. It should flow better as well)

'Your hand fits *perfectly in mine

The world has stopped

And so has time

'Cause we're in love

Kiss goodbye, savor the night. Parting is hard, curse the sun worship the moon

You and I are too good to be true. 

We think we are invincible,

We seem so unbreakable.

'Cause we're in love.

Hearts swell with joy,

Break with sorrow.

When you walked away from my life, You walked away from us.

She came into the picture,

She took you away.

To think we were so invincible,

we thought we were so unbreakable.

'Cause we we were in love...

In love...

I wanna hear you say you need me, Like you used to before she came. Things have changed,

everything but my feelings for you. We used to be so invincible,

We thought we were unbreakable. Cause we were in love...

So in love...'

If you have any questions about how I edited it, please ask.

Thanks for sharing! :)