Dude, listen to yourself. You sound like you're trying to talk yourself out of all this advice everybody's giving you, even though you know better.

If you go crawling back to her, she's just going to break your heart again! Plus she's 16 freakin' years old! I don't care how mature you say she is, she's still a 16 year old, that doesn't know what the hell she wants, and doesn't care who gets hurt in the process of her doing everything to find out what/who she want's in life. Just deal with the fact that she left you and work at getting over it. It's not the end of the world (even though it might feel like it).

And findally, you ought to be ashamed of yourself talking about one of your guitars like that! Now, go over to it and appologize right now!