The 'Fantastic Four' actor accused Alice Evans of harassing him and his girlfriend.
The former couple are going through a bitter divorce.
The actor opened up in a post on Instagram.
The couple's marriage collapsed earlier this year.
Alice Evans has spoken openly about her divorce from Ioan Gruffudd on social media.
The star said Gruffudd has ghosted her for 10 months.
The Welsh actor filed papers to dissolve their marriage of 13 years at the Los Angeles Superior Court on 1 March.
The pair have been married since 2007.
Evans originally announced on Twitter that the couple were to split after 20 years, in a post that was then deleted.
The couple have been married for 13 years and have two daughters together.