My DH goes supermarket shopping on a Sunday, and more than once he has come back with his shirt open at the bottom (to me, like he had tucked it in whilst seated). I think he is getting a bj of a prostitute in Asda car park or something. Writing this makes me feel pretty ridiculous, but I know what I saw. I can't follow him as he will see me. What's left? If I track his car, it will probably only show him at the supermarket anyway. What to do?