Is this a sign that my spouse is cheating on me?
First off, you NEVER wake up in the morning and start to accuse the other of cheating. That never happens in real life. The accusations come at night when something isn't right or someone isn't on time. In the morning it's someone trying to pick a good time to confuse his partner, not because they did cheat but because he did and is feeling guilty about it. These people also end up feeling if I did it then she did it and come up with those crazy accusations. It is a deflection of what they are doing to try to get you off their trail but it's the best indicator there is trouble somewhere else, like where the accusations come from.