Is there any clear cut signs with infidelity

[Hope_11]

I would agree the cell phone is big clue. My H all of the sudden paid the cell phone bill before I even saw it when I always paid all the bills. Also, if they state that they are unhappy in the marriage out of the blue and start to build a case for why they are unhappy with crazy reasons. I would also say if they act guilty or accuse you of being unfaithful that might be another sign. One night I dropped by to see my H at a bar, and the first thing that he said to me was...what are you doing? checking up on me. It was the guilty conscience talking.