Sometimes you can just get a vibe from someone (even from a basic description) and know something just isn't right. If I were in your wife's position, I would probably have been really frustrated with your pissyness until you figured out why you were feeling it and explained it to me.
Do you two normally meet each other's potential dates that early on? If you don't have a general rule about when you meet others, you might want to figure one out based on this experience. Getting the occasional bad feeling is one thing, but if her seeing someone 3 times without you meeting him/her is going to be a problem in the future it would be better to deal with that head-on instead of waiting for issues to come up.