Because I am afraid
I won't be able to hide from you,
and I fear you won't love
what you will see
if you decide to stay.
^^This is what we all are afraid of; to expose ourselves to our partners, boyfriends, mate etc because what they see might make them walk away from this relationship. But I guess when someone truly loves you they get to know you-good, bad and everything.
You have written this like a letter that is intended to be given to your love or speaking it as you write it. Either way, it feels like real life!