I want to be done with you hurting me

Not sure what’s hurting me more:
Seeing how happy you are without me,
Or seeing how unhappy I am without you.
You don’t know me in public,
but you want me in bed.
Not even a hi, not even a hug,
and definitely no goodbye.
I keep resisting the urge to make
mistakes.
I am not just a vulnerable
piece of meat.
But my feelings don’t seem to matter,
‘cuz in this world
everyone only uses each other.
Now tell me the reason,
Why are you using me?