What he isn't making clear is Janet could only communicate while at work not at home!! This is her work computer. Janet talked to people while at work, because she couldn't while she was at home.
Whether or not Janet and Scott continued a friendship goes to show how starved she was for some sort of normalcy. Scott was married at the time, flirting in emails has nothing to do with cheating. She never cheated.
After she had Kaiden, her personality started coming back to the old real Janet because she was probably tired of being a doormat.