HOW DO I GET RID OF GIRL IN LOVE THE MOST....!!!!!!!!! need girls to answer.....?

Hi friends, i am looking for a relationship solutions... me and my girlfriend , we were in a relationship, for last 1 year. she was a tenant of mine. she is very lovely girl. we talked a lot , and one day she proposed me. we both helped each other in many ways.. we had a very close relationship being it physically or mentally. she cared me like more than my mother...!!!!!! . i loved her a lot. but now she is getting married because of her family pressure although she know the guy she is marrying too.. (for Indian : caste marriage) . i realized about this love , when she told me that is getting married to some one, and we cannot marry each other and all...... this brought me tears in my eyes.. that was the point when i felt that i am in real love.......!!!! now she left my house , but i cant abble to forget her now.. memories brought up tears on my eyes. she too felt like this as she texting me regualary about all stuff.. i am really depressed , and tensed. i lost my interview because of this.. :( . finally before her marriage date, we met and i decided to tell that we should move on.... but internally i dont wanna to be..like that, she cried alot and me too... she told me that she is love with me forever until death .. marriage wont affect our relationship.. but i know in later stage of life she will might create a huge problem into her life. i dunno want to be any trouble into her life.. so i decided to move out of her life forever.... but this feeling haunting me...plzzz advice me ... i need suggestions practically and emotionally .. thank you guys