Commas,,,,

I, I never knew.  

I, I should have known.

I'm, sorry.

I, I didn't react.

I, I should have.

I'm, sorry.

I, I believe you.

I, I should have known, to react, to believe you.

I'm, sorry.

I, I'm here now.

I, I won't leave.

I, I promise you.

Yes, I, I love only you.

Now I, know what I should have known, to believe you, what to react too.

And, say I, I love only you.