Why does my boyfriend hide his future plans from me?

I just discovered that he is planing to go abroad for his studies , he never told me , I feel really upset about it , he still didn't tell me , I just knew when I went accidently through his email , is it a sign that he is not serious with me and doesn't have me in his future plans?
Why does my boyfriend hide his future plans from me?
Why does my boyfriend hide his future plans from me?
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