The Torah actually says that Love starts after marriage. Check out Yitzchak&Rivkah “
It is Rashi who interprets the pasuk to eman that it was after marriage that Yitzchak loved Rivka. That is not halacha, however, that it has to be that order. It is true that a more lasting and deeper loving commitment forms after marriage, and that is more important than the ephemeral emotions that couples have prior to the chasunah. But love starts when it starts, before, during, after, marriage, and even in some rare cases, after the death or even divorce of a spouse, when one realizes what one has lost.