Last Friday Night's Gossip

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I have a friend, we're not that close actually, but I still consider her as a friend. She is the girlfriend of my husband's brother. My brother in law and my friend live together next to our house but they're at home only every weekend. They stay in their works the rest of the week. Last friday night, I saw my brother in law arrived home. I was surprised because he used to go home with my friend every Saturday night. What shocked me more was he's with a tall young lady and they seemed to be close. I asked my husband about it but he told me he knew nothing. I tried to erase my malicious thoughts. Saturday morning, I saw them again. Before the girl left, she hugged and kissed him. Confirmed! That Saturday night, my brother in law arrived home with my friend. Everything's normal. Except for me bothered about what I saw. Should I tell her about it or just ignore it?