My last girlfriend was a lot like this. She ended up dumping me because I changed my mind about moving in with her, because I wasn't very happy at home with he

My last girlfriend was a lot like this. She ended up dumping me because I changed my mind about moving in with her, because I wasn't very happy at home with her. I think she's probably seriously depressed, but hides it with anger. I have no idea, unfortunately, how to help her, and don't think I can; she refused to even communicate with me after the break-up (which was by text message).