<human>: Ok so this is a pretty dumb situation. I got a call yesterday from the girlfriend Emma saying she plans on breaking up with my best friend John. She told me she was telling me ahead of time so I would be prepared to take care of and support John once it all goes down.

He's kind of a wild card in regards to his emotions and whatnot so I suppose I appreciate her tipping me off. But I didn't want to know about it. Their relationship is their relationship, I don't have any stake in it. I made the mistake in the past of getting in the middle of their problems and trying to mediate things between them and all it did was worsen my relationship with John. Though I guess Emma now sees me as a real friend for stepping up for her.

What do I do now? He has no idea what's coming, and right now I don't plan on telling him. I feel bad everytime I talk to him but a) he brought this on himself and b) I think she needs to be the one to tell him anyways.

Can you condense the text into three sentences or less?
<bot>: My best friend's girlfriend told me she's breaking up with him. He has no idea it's happening. Should I tell him?