Guys, what would cause you to lie this much?

Anonymous
Our relationship had no problems, no arguments insane chemistry, same life goals. He kept telling me how happy he was, planning a future with me. He broke up with me because he was being relocated far away (military) and he couldnt do long distance despite me wanting to. Even as he left he said I was everything he ever wanted. Now I find out that not only he lied where he was being relocated to (50 mile journey from here as opposed to another country), and that he started seeing someone who lives near me whilst we were together who he is now seeing long distance. I don't understand what I did wrong, men would anything cause you to lie this much? Is there anything in a partner that would make you do something like this? Just trying to understand, since he gave me no closure or option for clarity, and lied about everything.
Guys, what would cause you to lie this much?
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