Younger women are naive and if their parents didn’t teach them, sure they will definitely roll with you just off feelings and not being properly courted while in their “prime” years. But when they smarten up or get exposed to better treatment they are out the door.That's basically what @Gloxina was saying in regards to young women
OP said his business brought in way more than whatever salary the young dude has, but is the young dude able to still take her out on dates and have experiences like him? Was OP showing her anything markedly different than a young dude willing to spend? If not, why would she stick around?