I read this somewhere and have thought about it, and it seems in my case that yes, that is something of a truism!
For instance, you're most attracted to the fact that he/she is confidently flirtatious, but when you get together, this is the one thing which is a major annoyance and you'd wish he/she would stop doing it.
I wonder if anyone else has views on this? Will post and run - just idly wondered if anyone else has noticed this phonomenon...