BF lied about texting/chatting with a woman. Saw message on his phone. He had no idea that I saw it. Seemed innocent, but when I asked if he knew a woman with this name, he said barely and that they only talk couple times a year. I asked when they last spoke and he said he couldn't remember, but no time recently. It was a total lie as it was the day before. If he is not cheating, then why lie about something innocent?