Bill Gates admitted to “causing a lot of pain to my family” exactly one year after he and Melinda French Gates announced they were divorcing following 27 years of marriage. The Microsoft co-founder acknowledged during a “Today” show appearance Tuesday that it’s been a “tough year” but feels everyone in his family is “moving forward.” When asked about speculation that he cheated on Melinda, the billionaire didn’t go into specifics. “I certainly made mistakes, and I take responsibility,” Gates told host Savannah Guthrie. “I don’t think delving into the particulars at this point is constructive, …