Baz wants to die and is sick of unrequitedly loving Simon, so he's like "fuck it" and tells Simon because it's win, win; either Simon wants him or kills him. But Simon is an idiot and thinks Baz is just plotting. Thus Baz keeps trying to tell him. Inspired by the incredible @nerdflighter on tumblr and this post http://carry-on-the-rise-of-snowbaz.tumblr.com/post/170546215905/nerdflighter-somebody-should-write-a-snowbaz