Dear Prudence,
A year ago, my boyfriend’s adult daughter sent me photo evidence of her father on a dating site for married men. He had used the service while married in the past. Naturally, he denied it, but I found credit card activity that proved otherwise. I have asked for more transparency (credit card statements, unlocked cell phone) but he refuses. I fear I’m being taken for a fool. What are my options?
—Trusting to a Fault