1) It appears that the bail has been granted on the premise that the boy will marry the girl in 1 month.
2) In general, the bail condition(bail only if boy agrees to marry the girl) seems to be totally against law and warrants a review by higher court. as Bail in general for rape cases might not be available for the first 30/60/90 days (depending on severity of offence), but in your case, it appears that your lawyer did not make enough efforts to secure bail by moving higher courts or making a pleading that the accused is NOT likely to run away from trial OR the accused will NOT tamper with the witness.
3) So you need to move the high court and file a petition u/s 439 cr.p.c asking for review/relaxation of bail condition (to review the condition to marry the victim for grant of bail) and get this relaxed.
4) Once this bail condition is removed by the high court, you may then contest the case and also seek alternatives to settle the issue.
5) Assuming the boy and the girl get married, for divorce the couple will have to wait for 1 year before filing for separation and the boy might be forced to give alimony to the girl and the girl might also use the rape case so as to make higher claim. So getting the boy and girl married and then filing of divorce might not be a good option in present circumstances.
Hope this information is useful.