This is the only correct answer the issues is the average man will have fukked less women than his partner has fukked men. There's a reason why those who know say it won't work if you like her more than she likes you. She already has a ton of unspoken leverage, if you like her more/don't have more leverage on the emotional/mental front you're FOOD
If you don't at the least feel on equal footing in terms of experience it's a countdown to breaking up. Honestly I could say the same for if she doesn't get off with you consistently, and mad other shyt. Especially with how divorce law works, you can't be in it for the long haul with a woman you iffy about period, logical or not, justified or not if something is persistently bothering you about a woman leave.
Whether or not the man in the equation needs to work on self varies from case to case, in this case dude needs to get a square chick or fukk more women, because if he doesn't have confidence from his career, accomplishments, or innate self-esteem at this point, he won't grow it over night.
Of course things are going well NOW,
they're late 20s if he was nerd, probably made good grades, and got a decent job/career. She's looking for the guy that'll provide her attention, companionship, financial, and emotional security forever and ever, (or at least until a lil after the marriage, then she can do whatever).
Truth be told if he met her in college she probably dubs him, but nerds/geeks/regular/nice guys are generally expected to just be pleased with female attention under any circumstance and believe it was them like BBD, as opposed to their situation+her situation+chance/luck
She btw could quell all of this by being freaky/giving mans a 3some, but she won't but I'm sure she would for someone with higher playing rank.
The game is the game, play at your own risk