Sounds like you're being greedy more than anything else, and blaming your prior religious beliefs is a way to justify this.
Sorry to be so blunt but I call it how I see it.
You say its not about sex, but then go onto say you never dated because premarital sex was not permitted so there would not have been any point in dating.... Then you change your tune and say your personality disorder kept you from dating...
Whichever it is, idk maybe its a combo.
Maybe you're not greedy, maybe you're simply not the monogamous type and that is actually the issue, not religious aftermath.