Heartbroken

I love him, he has another woman he wants to marry, she lives in another country. He does everything for me. Recently I moved to his place due to proximity to my work place, I feel like an advanced side chick, I cook, have sex, clean and act like we are married. Aside he having me around, he still talks to random girls, sex chat them and call them. I want to leave him, I love him, but I need my freedom, he is not going to marry me, we work in same place which makes it very difficult for me. I'm loosing my mind.