Why did his family lie to me?

I been asking him is he married but his family claimed that they didn’t know her. I found out that he’s married and been married to the girl. He’s been lying about who he was this entire time. I asked his aunt who she was and she deleted the wife from Facebook. She kept asking the wife “ who are you” in the Facebook comments. he’s been married for many years now

Why did his family lie to me?
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