Do I tell her that he's cheating on her?

On Friday one of my best guy friends told me that he was dating a girl after I asked him about it because I saw them talking together a couple of times. he said that they were "secretly" dating because of her mom and that I couldn't tell anybody. I didn't really care because I hardly knew her. but today I just found out that my little sister's best friend(who is a close friend to me) is also dating him! and they are doing it "secretly" because they just don't want people to know...what do I do?
Do I tell her that he's cheating on her?
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