He will understand when its time, simple rule about longterm relationship with a woman is-for her to love and respect u she has to think(no matter if its the truth or not) u are her best possible option (hypergamy is a thing, women chose best candidates to mate for tens of thusands of years).
From that premise alone come all male boundaries and red flags we see in women, coz lets even assume we got sweet innocent girl who is virgin at 18, by the time she is looking for marriage she is already close to or above 30yo with masculine independed bossbabe attitude and 50+bodycount, meaning in that 50penises that was inside of her definitely was at least 1 if not multiple atheletes, 1 rich guy, likely high 6 figures if not some1 who makes 7 figures, 1 really funny guy, 1 very charismatic guy, 1 tatooed af badboy who always gives her emotional rollercoaster most women need, B-List or hell maybe even A-list celebrity(actor/musician/rapper/influencer even, some1 with high social status basically), and so on and so on...
In her mind she was "dating" if not all than many of those guys, while in reality she was just cum dumpster and plaything to them, never treated seriously, she thinks she is in their league tho, 8/10 or even higher.
Then u expect such a wreck of creature to settle for avg cubical joe shmoe with his 5'8 height, 50k usd yearly salary, skinnyfat body(to women dadbod is what jason mamoa has ;p) which happen if she is preasured by her bliology/wants kids/ring, but then she thinks she deserves far more and made that avg guy a favour, is nagging and extremly quarellsome bitch whole time they are married and she divorces(takes half, sometimes even more) that poor fker first chance she gets- reason- she wasnt happy in her marriage- suprise surprise, marriage isnt to make u happy, its duty to rise kids