A friend now my enemy

At first we were cool
Learning things about each other
Then we learnt more
How some things affect you and me
Now its like another whole side of you
We could barely say things without a fight
Most of your friends now strangers
I should have know
I should have stop while I could
But I believe everyone should have a friend
I wanted to be your friend
Now I'm in too deep
May not be able to get out
For my heart strains me here
Not wanting let this friendship go
But I will get out
I will become a stranger
I will become a blank face
I will become your enemy