Why does she keep doing this?

I was with this girl for 4 months and I always thought we were a pretty happy couple. Then one day she just broke up with me. I was devastated, but a year has ped, and I'm over it. I'd like to have our friendship back though. So, I texted her, just trying to start conversation, and said "Hey! Have you seen the new "______" and she said yeah and we texted for a little bit, then we both went to bed. The next day, she texted me again, and we talked continuously throughout the day. I hate to just stop texting people because I hate it when people do it to me, so I just try to break the conversation by texting back "ok" or something like that, but she keeps texting me. Why is she doing this? What does it mean? Thanks.