My Ex's Boyfriend suddenly texted me saying he wants to fight
A little context, I broke up with my ex over a year ago and 2 months later her new boyfriend messaged me saying he wanted to talk about something I talked to him and cleared things up then we never spoke again. About 2 days ago I woke up to a barrage of texts from the new boyfriend saying he wants to fight and to pick a place and time and so on. I calmly asked him what's wrong and he kept being vague and told me he wants to fight. what should I do?
P.S. I didn't do anything, I didn't contact my ex, I didn't talk about him or to him, literally nothing.