Why is she ignoring me????

I told this girl shed be the next girl I'd date back in December. But I dated another two weeks later than another a couple monthslater but didn't tel her til after a couple weeks we were dating and she was pissed ad called me a player and everything and she cuts herself and has depression and attempted suicide and I told her I'm sicki Cher and id be so much happier without her and she just started ignoring me why is she being a ***** what did I do?!