I don't know. When I see someone being joyful about their new found love, I smile. I suppose I might not if they kept this up with new lover after new lover, but most people only get giddy once or twice.
Marriages do fail sometimes. I don't think that always means it was silly to start with.
My wife and I will be celebrating our 54th wedding anniversary this summer. I still think she's a foxy chick :)