Get involved or not?

I’m dating this guy who I really like (obviously), however he has an ex who has been trying to start drama and spreading lies about him. He tries to ignore it and not get involved, but she’s trying to get an old friend of his to actually fight him or something? I heard this from a friend of mine... and honestly, it’s bothering me. Should I just confront her about it and tell her to leave him alone or just ignore it?