Love is not breathlessness, it's not excitement, it's not promises of eternal passion. That's being "in love", which any of us can convince ourselves we are "in love". Love itself is what's left over when being "in love" has burned away.
A marriage needs love, trust, honor, respect and BOTH partners need to embody those words: be loveABLE, trustWORTHY, honorABLE, respectABLE.