Watching anime to get a girl? That's going to be very, very counterproductive. The thing about anime is... once you start binge watching... it doesn't stop
Infatuation, or actual love? Let me tell you, when you spend time with someone, make plans with them, and then they leave for reasons that burn and sting every day and every night, you can feel passionate hatred for them, but all of that hatred needs fuel, and that fuel just happens to be love that we all like to pretend no longer exists afterwards. The best thing you can do in that situation is accept that you still love them despite how bad they destroyed your fragile heart, and then accept that despite that you're better off without them because of their actions.
Of course, that's my advice if you just had your heart torn apart because they decided to cheat/manipulate you. If you just had a crush and they didn't feel the same way, no need to get so bent out of shape. Now, if they were knowingly leading you on in order to extort you, then that's just messed up. Don't let that ruin your perception of reality. There are guys and gals that do that everywhere. Despite that, there are also good people if you can just push yourself past your fears.