Am I wrong for being mad at my fiancé for lying to me?

Anonymous

My fiancé is the best man I know. He’s the love of my life and has never given me a reason to doubt him. We made a promise to each other that we’d always keep it real and never lie even if the truth hurt. He’s an only child. Or at least I thought he was. Last week I got a Facebook message from a woman claiming to be his little sister. She said to tell him she was sorry for everything she had done. All the pain she had caused. I couldn’t believe it. I asked her to elaborate. She thought it was best it came from him. I confronted him and he confessed. That is his little sister. She got heavy into drinking and drugs and caused a living hell in their lives. When their dad was sick she never went to go visit him in the hospital. Never spent birthdays with their parents. The last straw was when his mom passed. His sister never visited the hospital. Barely even made it to the wake. Since then he told her she was dead to him. He needed to get away and moved literally across the country (East coast to west coast) to start over. He’s hated her ever since. I’m hurt he kept this from me. We all have family secrets but as a soon to be married couple I feel like he should’ve told me. I was pretty pissed and he thinks I’m overreacting.

Am I wrong for being mad at my fiancé for lying to me?
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