People are human and humans make mistakes. I cannot tell you how many times a wife comes to me with "suspicions" that her husband is up to no good based upon changes in his behavior..strange withdrawals from the ATM (wives have been known to follow your withdrawals and check wallets the night the husband comes home (one even kept a ledger!), odor of perfume, etc...It's a lot easier than most people think to trace your activities via researching phone, internet and financial records. I deposed one male paralegal that gave me a trove of dirt on a boss he despised b/c he was so smug about fucking around behind his wife's back.
Get a hobby phone!