What’s a good spell to remain no contact with someone?

As the title says. Just recently with no contact with my daughter‘s father and it’s the best for the both of us, but he’s having a hard time and has been in denial for a very long time that this relationship is toxic and not worth it anymore every single time I bring it up he then talks about how he’s no longer gonna support help his daughter and it’s not worth dealing with him anymore, so I rather him never contact us ever again. What’s the best spell for this?