Opening arguments at the Johnny Depp trial with Amber Heard

I went down the rabbit hole of watching this yesterday and something doesn’t sit right with me.  This is a lawsuit that Johnny is bringing against Amber for defamation.  What is interesting is that if he knew he had done terrible things to her (she accuses him) why bring suit against her so all of that would come out if true?  I only watched a bit yesterday but I think I’m team Johnny and by the way that is not becasue I condone any