Love failure

Iam a chartered acctnt.Girl I loved madly left me with out caring anything about me. Her reason was cast issue in fam. She belongs to higher cast as per indian cast system. She left me last year sep, becoming worse since then. She used to be my colleague, can't tell this to anyone as we have common frnds. She blocked me, stopped talking with me. I'm introvert person. Once she used to say she likes my introvert, book reading habits . Now she started saying stop staying alone, ur alone that's why you remember me every time. Being alone isn't new for me. I cry almost every day. Day starts with her thoughts. One of my common frnd, suggested her to block me.. She knows about my character. I literally begged her to stay with me. It's feeling so empty every day. I begged her at least be friend with me. I shared so mang personal insecurities with her always stayed honest with her. She is very good girl. I do not have much frnds thought she will be my good frnd atleast . I asked her shamelessly to be my best frnd. Encourage and cheer for me in difficult times. Expected so many thing's from her at least as a frnd. But she listened so much to her frnds and choose to leave me completely in fact she complained I may use our talks photos to blackmail. Only I know how much I cried after hearing this. She knows how much I love her I compared her with my mother. Used to call with Nick name I used to call my maa. More than she left me the feeling that she treated me like scrap is haunting me more. We had so many good moments to gether. It's been more than 6 months she left I'm still feeling depressed. Had so manu suicidal thoughts but came out of those after thinking about family. But this depression haunting me.