How could I get my love back after I cheated on her?

I cheated on my fiancee when we are in a long distance relationship after i traveled to another country I deeply regret that I felt lonely and entered into a relationship with a girl at work.. she was sick with a chronic illness.. I stayed with her for six months, then told my fiancée about it and we separated.. I miss my old sweetheart very much, and I feel that I hurt another girl for no reason, whom I never loved and she is different from me, but I sympathized with her illness.. I don't know how to fix what I did I am dying in hell

How could I get my love back after I cheated on her?
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