What would it mean if your ex defriend you after 6 months of breakup?

[Sam]

So it's been around 6 months now after my break up. After the break up we are still friends on facebook and a msging app called Wechat. But recently, after New Years exactly 1/1/2014, she defriended me and I'm just wondering why. Like why go through defriending me after 6 months and she was the one who dumped me. She deleted me from facebook but not from the messaging app. She knows for sure that I use the messaging a lot more. So why bother defriending me from facebook but not the messaging app.

-She was the one requesting us to be friends at first.

[Andrew]

she is moving on