<human>: Can you condense the text into a few key points?

We were together for 3 years in a Long-Distance Relationship. We broke it off at around October-November 2012 (It was never *really* made clear what was going on), but we kept on messaging eachother/staying friends until August 2013. 

On August 31th we totally stopped all contact out of the blue. There was no argument or anything that caused it, we just simply stopped messaging/talking. She just started College (UK college, which is from ages 16-18), and turned 17 in the December just gone. 

Anyways, I removed her on everything I had her added on (Skype, Facebook etc) simply because it was becoming a strain to see her online but never having the guts to strike up a conversation, but forgot about her Playstation account. 

Fastforward to December 27th and she messages me while I'm playing on my
<bot>: My Ex of 3 years randomly started messaging me once again (in a nice tone) after 4 months of no contact whatsoever. What do?