I am going to marry a girl who liked her college fellow. He talked to her family also for marriage but her father refused. From the day I came into her life she is not talking to that fellow. They were talking on fone for last 3 years almost as a friend only before I met but now she loved me a lot. I am sure that she don't have any bad relationship with him in past but I am mentally very disturbed by thinking about her past when I asked her she told that she just liked him not loved but may be she is telling due to fear of break up of our relationship before marriage. I am in tension what to do please advice ASAP.

The past is the past, You have to trust. IF you can not trust then you don't know her well enough to get married

Live in present... and have courage to confront to her past. If u really love her... then accept her with all her times... even past... she has told you all about that... or u have discovered...
Whatever may be the case... beleive her and have faith

Control your fear, don't let your fears control you.