The pain won't stop

How do you get the pain to stop.
There's a stabbing pain in my heart that won't go away.
How do I tell him no.
He's using me and I can't bring myself to tell him to stop.
He's killing me.
I feel my sanity slipping.
But how do I tell him no.
I can't breath.
I lay in bed at night crying.
I'm terrified of things that shouldn't matter anymore.
I still love him with all my heart.
Can't he see that?
I want it all to stop.
I don't want to do this anymore.
Why won't it stop?