In my opinion, she lies because that’s her way of life. I think that your sex life is slowing down because you’re on to her lies, she may get off on her lies, and by you questioning her she does not feel as in control as she once did. I don’t think that this is an indication that she’s cheating on you, but keep your eyes and ears open. I can’t imagine what it must be like to be with someone that you can’t trust though. You may want to talk to her about that.
