One, accept it. Being frustrated or bitter about the current set of conditions is pointless & unproductive. All we can do is optimize how we play the current market--and to analyze it as objectively as possible. The average girl today has more options and more validation with less effort (a cute selfie every now and then) than a celebrity in the 1940's--it is what it is.
Two, don't take it personally. Girls have to make snap judgments--they just don't have the time or incentive to make in-depth comparisons of their options. If she quits responding to your texts or bangs some other dude, she's just doing the best with the set of information she has at the time. Nothing to feel bad or bitter over.
Three, play the numbers game--horizontally & vertically. With any one girl in any one movement, your chances are super low. But if you're talking to ten girls and hitting them up once a week over the course of the month, then your chances of getting the right girl at the right time goes up considerably. On the same note, if you promise hard monogamy her options aren't decreasing but yours sure are.
Finally, compete on the most favorable terms. On Tinder you're competing against a near-infinite number of options and doing so with the least potential to convey your value. In person, often you're the only guy with the balls to approach her on any given night. Or you might be competing against 2 or 3 guys over the course of the night. With practice, you're able to efficiently and effectively convey your value and to out-compete other suitors (often just by being less desperate and letting them blow themselves out).
Also the good news is that there are way, way, way more young, attractive girls with cool personalities than there are cool guys who know how to push the right buttons and give them the emotions they crave. So with the right tool-set you can meet more quality options in a given week than a girl will in several months. Play that to your advantage and always increase your tool-set.