This.
I was going to write something like this earlier. This isn't a criminal case, it's a civil case, where the court of public opinion rules. This a typical tactic used by corporations when being sued, paint the plaintiff in a bad light, discredit them. The burden of proof is also much, much lower in civil cases. It comes down to a jury or judge's opinion many times. Hence why her lawyer didn't release any factual information regarding the case, like as you said, a text saying keep the ring or her credit card statements.
EDIT: and this lawyer game being played doesn't necessarily mean I believe Mario or his ex. It just means they will both be spewing discrediting information in an effort to win people's opinion.