Apology.

I'm sorry.

I'm sorry I can't do it.

I'm sorry I can't try your way.

I'm sorry I can't be JUST that person.

I'm sorry I'm 'running away'.

I'm sorry I misinterpreted your actions.

I'm sorry I thought there was something there.

I'm sorry I'm so irritable around you.

I'm sorry I get bothered by the smallest things.

But Most Importantly.

I'm sorry I acted on impulse.

I'm sorry I took you for granted.

I'm sorry I couldn't see how well you treated me.

I'm sorry I couldn't keep my promises.