DEAR ABBY: I'm the youngest of three children and I'll be graduating from high school in the spring. My parents always seemed happy with each other. They were obviously in love, and they told my brothers and me they would never get divorced. Although they had arguments, they always made up, and it never seemed to be serious.For the last few months, my dad has been acting weird. He spends a lot of time talking to and texting "a friend" on the phone. The problem is, although the friend has a male name ("George") in his contacts, the person has a female voice. ...