How long did Sushant dated Rhea?

I just feel she was using him to get movies and was not serious about him. It is mentioned both has argument last week and she left him and packed her bags. Sushant sister came and tried to sort things out but rhea was not picking up the phone. So basically she was living with him and I think Sushant was madly in love with her and she was not. I got to know about her last week and smelled trouble. Many are saying Sushant was referring her to producers and directors. And she was even working with him in one movie. I think he wanted to marry her as well.

I feel bad for Sushant. Such a great guy and in return all he got was pain.