Gentlemen, if there's a girl with a perfect body, an ideal personality that you think will match yours, and just looking at her sends you brimming with happiness, but she doesn't respect you, stop pursuing her. Girls like this think you're a joke, ugly, or a creep. They'll never think you actually want something serious. Some girls may even not tell you to stop, because they LOVE the attention. They would never date you, but they don't want you to stop trying, because they love the attention you're giving them by watching you try, even though there's no possible outcome.
Girls like that don't respect you. And if you pursue them even after knowing that, then you have no respect for yourself. Girls that come up with excuses EVERY time you ask if they want to go on a date or hang out like, "Sorry, I have work", or "I'm doing something else with someone that day" really don't have any respect for your time. They still tease you and never flat-out tell you to stop, leading you on with no achievable end goal. Those are the worst. Girls who tell you, "Sorry, I don't feel the same", or "Please stop trying, you're not someone I'd date" are better, even if they hurt you. At least they respect you enough to not waste your time on a goal you can never achieve, so you can move on.