Yeah, dude, you're not alone. Had a similar situation with a girl two years ago. Yanked me into her life, forced me into quite a few couple-y situations(like grabbing my arm when I tried to leave before watching a Youtube video with her, or making me share her mac & cheese for lunch in the cafeteria), yet it was my fault when everyone thought we were a couple, because they could see the way I felt about her. Then, I was cut out of her life for it. Broke my foot kicking a wall(I knew not to punch it, because I already broke my hand doing that!), and it took me quite a while to really get over her. Now she thinks I'm stalking her because I went to her new job because they had a sale on soda. Trust me, if there's a crazy girl involved, I can sympathize.
Only advice I can give you is to try and avoid hitting things in anger. Or at least choose soft things. $400 is bad enough, but you don't want to break anything and have to pay hospital bills for it.