How come a guy waits for someone and then breaks up with me?

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so this man broke up with me after a girl just pops up out of nowhere. I asked him about her and he wouldn’t tell me nothing. I later find out he was married and now they expecting a first child. He told me they been together since 2014 and that he been waiting on her to finish her government contract. He told me that he wasn’t planning on staying with nobody or seriousness with anyone. He told me when we first met, it was love at first sight. I always felt that he was waiting on somebody because of how he been acting towards me.

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I just feel used
How come a guy waits for someone and then breaks up with me?
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