You have committed a grave sin and you ought to repent to Allah and never be involved in changing or having physical contacts with your daughter; nor are you allowed to be alone with her. For the rule says: that which leads to haram is also considered as Haram.

 

Now you don’t need to consider yourself divorced from your wife for this grave sin you have committed. It would be best if you were constant in seeking repentance and avoiding any isolation with her.

 

Almighty Allah knows best.