Advice?

My husband and I recently got married, and today he told me that his ex (they were together for 10 years) was spreading rumors about him at work and stuff and I was like well why would she all the sudden do this? Turns out, he had went over to her house and put an obituary of the guy she cheated with wife. Why? Idk. But what would y’all do? If your man was going to his ex’s house to do shit like that?