My wife and I have been married for 10 years. We have a 3 year old daughter Kate. Recently, I have learned that my wife was cheating on me with another man all these years. I took a DNA test and it turned out that Kate is not my biological daughter. I want to leave my wife and I don't want to have anything to do with Kate.
Unfortunately, whether or not you want to have anything to do with Kate, if Kate believes you are her father and you have conducted yourself that way, you would have to continue to be her father and be financially responseible for her until she is 21. You will have to pay child support for Kate. This is because the Courts look at what's best for the child, not for you. Of course, if Kate's biological father wants to take care of Kate, you might be off the hook.