My friend is asking me to lie for her. What should I do?

My "friend" is cheating on her boyfriend from back home with this guy from university in our friend group. At the moment, it's only emotional cheating although they've slept in the same bed together. I think her boyfriend from back home suspects she's cheating on him with someone because of her sketchy behaviour and ignoring his texts, and has reached out to all her friends including me to tell him honestly what's going on. He's begged me to tell him if she's cheating and has added me on snap.

My "friend" has hidden her snap location from him, and asked us not to engage/to hide it from him when she's with this other guy. She asked me not to add him back but I feel sorry for him. At the same time, it's none of my business what she's doing. What should I do? Should I lie for her?

As an aside, I did say to her that she obviously doesn't love her boyfriend and she got really offended by my saying that and said she does love him. And now is saying I'm being rude to her. I just feel sorry for this guy though, he has no clue. I think she's wrong for this.

My friend is asking me to lie for her. What should I do?
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