Good for you man. Not sure of your age, but women in the 20-27 range will more often than not have a greater sense of entitlement than older women. Women figured out their clocks. They know they can do whatever they want at a young age and wise up as they get closer to their wall. They get their cake, and they eat it too.
A females prime contribution to society, save a select few, are their looks. Their market value is at it's height when they are prettiest. For men, our market value is completely different. Sure, it's definitely beneficial to be more attractive, but out real market value is based on our utility. The more experience you gain, wisdom you have, and really overall monetary value, provide the essence of our worth. At a young age, you don't really have that. We do have the benefit though of not having a wall, especially in our 20s. The whole relationship clock is just a weird concept. Women are in their primes during a time when most men are still figuring themselves out.
Concerning oneitis: it's imperative to be happy and secure with yourself...with or without a woman's touch. Secks is great, as is connection with someone. But really, it's your connection with yourself that means the most. It's good that you feel at peace with your decision. You'll see lots of guys on here questioning themselves and wondering if their ex will ever come back. Women are just like men in the respect that they are just tryin to get by. The means to that end is of course very, very different. Here is one of my absolute favorite quotes of all time circling the pickup community, and it really does ring true:
"She may look fit, sexy and sophisticated, but after shes naked with mascara running down her face and shes trying to stuff her thighs into a pair of too small jeans at 2am, you realise shes just another person trying to get by."