Enjoy her, Sara. You get one shot at life. Meanwhile make sure your husband gets all the love and attention.
Obviously love is more than oxytocin. There is a realm in which people find love. People's whole being which you find appealing. Oxytocin is a blind substance. The eyes and the ears and the whole identity loves. But for some reason, despite the fact that we are bodies in this realm, some believe we are only our brains, which is just plainly and objectively untrue.
Oxytocin doesn't just "emit," though. What you do and don't love is determined by your identity, and the object of your affection. You could just force a person to take a pill that caused the release of oxytocin every time they saw a cat, I suppose, even if they hated cats, but I don't think it would go well.
Ultimately it's action, though. It's what you do that demonstrates love. We could call a feeling "love" but if it has no result in action, it's empty.
I personally have not experienced this, but, both my Grandmothers never married or had relationships after they lost their husbands. They told me, you only love once?????
Oh I don't know... people now are a little distracted with their internet & their cell phone. It makes love suffer, but I still remember the old days and think maybe other folks do too. Maybe there's a cutoff though; which is unbearable to think about. "If you were born after Generation X, your definition of love is damaged." Lol.
I think it also depends on age. My mom said that she had a good life with my dad, but a new relationship after all the years she was with him (60 years).....I don't think that will happen. At some point you say....it was and is (now) okay.