Ignoring the fact that I refuse to enter any relationship for various reasons, pretty sure it's a yes for everybody. I've seen it a lot in my friemds, all telling me they found somebody perfect, then a few years later they find somebody else who is perfect and the last one was a stupid whore/*****/whatever. It seems that during the relationship they delude themslves into thinking that a particular girl is actually different and special. That said I'm particularly cynical about this type of stuff, and I acknowledge that. So maybe I'm not the best person to ask about it.