Is it ever a good idea to message your exes after a while?

Kiera
We where together for about 3 months but talked for over a year, never really saw eachother much outside of school except parties we went to together and I felt like he wasn't proud of me in front of his friends, we argued a lot but not all the time. I just feel like because of the time I spent talking to him day and night I have a bit of a void in my life and want to talk to him again... Opinions? 

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