The Dr Helen Fisher summary. All peer reviewed, shoving people in MRIs to look at their brains, lab tests for hormone levels yada yada yada.
In love = Dopamine based excitement / OCD like mental obession on person of desire. (This is why SSRIs can kill off romance and interest in sex btw) The addition of Game understanding is that Alpha Traits compliment this process.
Pair Bond = Oxytocin / Vasopressin based emotional bonding and closeness. The addition of Game understanding is the Beta Traits compliment this process.
Sexual Drive = Testosterone based all purpose generic horniness towards the opposite sex. Physical fitness compliments this process.
The thing is women don’t just leave a man they have a pair bond with because he’s not alpha enough. The leave him because another man enters the picture and they have “in love” feelings for him and they get the Dopamine OCD thing happening about the new guy.
When a woman tells a man ILYBINILWY (I Love You But I'm Not In Love With You) that means 9 times out of 10 there is a guy she is in love with that has entered the picture. ILYBINILWY is female code for some combination of "I'm leaving you for him", "I'm thinking about having sex with him", "I'm having sex with him but I want to live with you still is that ok?", "I think I might be pregnant and don't know whose baby it is".
A woman can have minimal “in love” feelings the husband she is pair bonded to and just coast along for YEARS with no apparent cause for concern. I know of marriages where the wife clearly routinely craps all over her Beta husband and has done so for years and years but the marriage continues on unabated anyway. It is of course quite easy to be faithful if no one else wants to have sex with you.
But once a new man enters the picture that flips her Dopamine on, things can unravel between a wife and her overly beta husband very quickly. The OCD like effects of the Dopamine response can overwhelm the strength of the pair bond. The woman gets torn between the two men she is chemically drawn too. It's not an easy emotional state to survive in for long. ILYBINILWY is also female code for some combination of "I have no clue how to make this decision", "are you going to fight for me?"
As a final thought and adjustment to some of the bulk of this post. There is a growing sense of entitlement in women that their marriage relationship will be magically "in love" forever. Older women tend to not expect this so much and generally just stick with a boring beta husband unless someone actively starts trying to game them and hooks them. Younger women feel far more entitled to this though, and they may simply begin to actively search for someone that excites them without a specific event.
Plus for my female readers, the core of this post "in love" vs pair bond works exactly the same way for men too. Be advised to show cleavage and leave no question in his mind that you're good in the sack. At the heart of things, this is what men want from marriage and how they experience love and pair bond to you. The rest is just details.

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Thank you for commenting, much appreciated.