We had been having some trouble in our relationship, but we met up and talked things through and she told me she would never leave me. Not even two days later, she tells me that she was lying and she is, in fact, leaving me and doesn’t care about me much anymore. This broke me as I’ve never had a FP relationship as intense as the one I had with her, and after a short stay in the mental hospital due to a particularly severe episode, I just feel completely empty inside —like there’s a void inside me where my love for her used to be. 
I’m going to DBT and I’m on meds, but I feel like I will never truly recover from the way she left me. Anyone have any advice or similar stories?