It's a widely-held view that marriages (or any long-term, opposite-sex relationships) go thru an infatuation/love/lust "eros" phase in the beginning, and then settle into a more "agape"/"phileo" love phase the longer the couple is together (still with plenty of "eros" love if the couple works at their sex life). This is why Phil McGraw makes that important distinction that he does (or is it Tupy?) about how unfair it is to compare the giddy rush of a new, adulterous relationship, with the feelings that the wayward spouse has for their husband or wife.
