Lots of people have difficulty accepting rejection - especially when it comes to something as personal and sensitive as the world of dating. However, that NEVER excuses behaving like a nutjob asshole. If you put yourself out there, you have to accept that rejection could come with any romantic pursuit. And if you're the type of person to go completely bonkers when someone doesn't like you as much as you like them, odds are you're going to meet with LOTS of rejection in your life - BECAUSE YOU ARE AN EMOTIONALLY UNSTABLE WEIRDO.
Don't be a weirdo who goes insane when you get a "no" response. When someone doesn't want to be with you, be an understanding adult. Please. I beg of you, internet.