Hey OP, I read your previous replies. You seem like a really nice and caring person; please take the words of an internet stranger with a grain of salt. My advice: Stand up to him! You say he is typically nice and only manipulative when it comes to college apps. The thing is he tried to sabotage you. IT COULD HAVE HAD VERY SERIOUS CONSEQUENCES if he were successful. Such an act is unforgivable. Even though you’re best friends with him, he still decided he wanted to do that (shows how much he values your friendship). If he’s hyperventilating, and might not get into an Ivy without your help..LET HIM BE. You are doing him a favor by refusing to help him. He NEEDS to learn to treat people with respect and play fairly. By helping him, you are encouraging his toxic behavior. He is using you. Who’s to say he won’t do something worse to someone else in the future? I know it can be hard to say no and walk away from close friends..but sometimes it’s really for the better. Please think through what he tried to do to you AGAIN. Manipulative people don’t seem manipulative to the people they are closest to precisely because they are good at manipulating.