You can't blame them. They're over 30+ and single. What do you expect them to do? Fùck around with someone that'll end up sleeping with them and moving to another girl? I don't blame them one bit. There's no machine to reveal the true intentions of men that come around them. They're only trying to know if you are serious or not. Though I must say, that strategy of theirs don't work most of the time, because a sharp guy can play along, get what he wants and still walk.