The fact Dave told you she had been visiting and for what reasons shows he has no hidden agendas. It's if someone hides the fact they have been seeing someone you want to worry. It's clear Dave loves you BG. I don't think you should worry too much, don't forget there are men out there who would gladly sweep you from your feet and take you away from Dave. But I'm pretty sure that wouldn't happen, judging by the kind of person you are. You just need to trust Dave. I guess there's nothing wrong with taking Dro's advice though, just don't over do it.