How can he do this to me?

I've known this guy for 3 years. We work together, he's my best friend and I enjoy every minute with him.

He changed 2 years ago and we started being intimate and he could never wait for a chance to touch me.

he's always known how I feel. Two days ago he tells me he can't see me in a romantic way and wants to date the receptionist. Told me to grow up and accept it.

Im miserable, i feel im dying. can't sleep can't eat. This was my first time being in love and giving someone so much trust.

Is this my fault somehow? How and when will i stop crying and feeling like crap about this?
How can he do this to me?
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