Because she has depression, being over ****y, too confident will make her feel insecure, and perhaps more depressed. Throw all the fckin rules you learned on this site away for now, and use some common sense. Sometimes thats all u need, some logic and common sense to bang girls. some people go way overboard with this crap.
Listen, she has some insecurity issues. You think by being ****y and arrogant is going to make her fell better!? Instead, you should have RELATED with her. Have her disclose some info, relate to it and give some good advice back. At times be sincere, honest and REAL. She doesn't want anything to do with you anymore because she doesn't like the way you make her feel. Now she has associated those feelings with you. game over.
One last point. I cannot stress it enough, it's vital to read and understand a babe before you game her. The **** you learn here is NOT a blue-print. Some of us here just go around like puppets respiting out the same garbage to every girl they see. Yeah, ****y-funny MAY work, if she's a stuck up b!tch, and playing games with you. If she's an attention *****, gives you no respect, then yeah, go ahead and neg her.
But when you meet genuine girls, just be sincere and honest. Its ok to be gracious. On a date, you think she looks pretty, go ahead and tell her that! Don't tell her she looks like **** or that her hair looks like a poodle! I swear some of the advice on here is ridicoulous! Yeah you'll come off looking really good saying that crap, lol.
All I'm saying is use some logic, understand what kind of girl you're dealing with. More often than not, your dealing with a girl who's down to earth, and just like everyone else on this planet, has insecurities. use common sense and make her feel good! It's not rocket science.