Does it happen to me? Yep, all too frequently. Even with someone I'm not in a relationship with; when that happens, I have to constantly tell myself "she's
not your girl. DON'T GET ATTACHED."
As to how I deal with it, that I still haven't fine-tuned yet. Or really figured it out yet, either. Unfortunately, I still seem to live my life by the line from a Doors song. "Hello, I love you, won't you tell me your name?" And my idea of taking things slow is meeting her parents
before the wedding. It's crazy, I know, but I've heard that some people do it that way.