Divorce

Hi my name is suresh. Iam married from last 6 months i loved my brother's wife from last 2 years & we both loved very much she has a son also we both want to merry. My wife & her husband don't want to give the divorce. Pls help if we run away & then aplied the divorce paper it is legally right or not.
How i get her becuase she loved me very much she has also comitted suside 2 -3 times & i don't want to lose her pls sugest some way i don't mind if it is legal or illegal but it should safe. I am hindu. Pls pls give your valuable sugestions or ideas
thanks