Marriage and monogamous relationship start an alchemical process of maturity. You are forced to overcome infantil behaviour through painful confrontation with how you treat yourself. (Men see their Anima in their girlfriends, women see their Animus in their boyfriends.)
what IS a true, healthy, long-lasting romantic attraction or interest?
When you managed to step out of infantilism (like your partner) you mirror each others unconscious to some degree.
The men becomes the leader of the Animus and women become the saviour of the men's Anima.
Men will seek the Gaia or Terra in their woman because their Eros isn't as strong as the women's one.
Women will seek the Holy Spirit in their man because their Logos isn't as strong as the men's one.