• Psychological disturbance created due to love relationship

Me and my girlfriend (Childhood friends) were in love relationship since 17.09.2003
Though I personally talked to her parents but they rejected my appeal in 2015 , Since the girl was constantly harassed by her relatives everywhere not to marry me, she finally decided that she will go along with her parent's decision and marry a person from her own community.Our twelve years (2013-2015) old relationship finally ended.
Now the period from 2015 till 2016 was a horrible period for me, I was shattered, my life completely chagned, many times I tried to commit suicide , I used to stay in my friends house to avoid harming myself. I used to cry every morning and night. My family was disturbed. My professional life was hampered. I was under intense trauma and psychological disturbance. Despite my above situation I did not disturb her
Now at the end of December 2016, we met again and when I proposed her for marriage , she agreed.I was so happy. I felt that she truly loves me and has come back to me after 1 and ½ years of break up. 
She said that in July 2017 we will talk to her elder sister and try to convince her. She further gave me hope and assurance that even if no one agrees we will still marry. 
One night she called me and told me that during our break up period of 1 & ½ years she was in an intimate relationship with one of her married colleague.
I was terribly shocked to know that, because during the period when I was supporting her so madly in instead of going by her parents decision, she entered into relationship with one of her married collegue, but since it did not work they broke up ,She also went to psychiatrist to come out of it. I was just recovering from the trauma of break up, but again her this news broke me completely, but still since I truly love her , I asked her about her decision that what she wants from me.
She said , if I can accept me , She wants to get married with me, to which I replied that If you are really serious about us, then I am ready to marry you because I understand past is past and nothing can be done to whatever happened. Though It was very difficult but I supported her now also.
She met my family, colleagues and friends were so happy about us. It was like we have set an example of what true love is. She went back to her places, everything was fine, but slowly she started behaving differently, she started misbehaving with me, started avoiding my calls. She was casual. She said she doesn’t want to get married.
And now I am again back to same point where she left me 2 years ago, At present I am in intense trauma, psychological disturbance, I am ashamed infront of all my collegues, I now feel that she has played with my life, honest emotions and feelings without me being at fault.
And I think I should get apology from her & make her realise that she has no right to play with my life. 
My question 
what are the action i can take legally , please advice