It's perfectly normal to bounce back and forth. Like anything else this journey you are will sometimes be a two step forward, one step back. Best thing you can do is recognize when you are taking one of those steps backwards and refocus your energy and efforts into more positive actions, i.e. go to the gym and work out, go get a cup of coffee at a local bookstore, or whatever it is that makes you feel better.
When she calls just be upbeat and positive. It's okay to ask her how her day is, but don't let the conversation linger. Keep it somewhat brief and it's better if you're the one to end it.
