Ex boyfriend trouble HELP

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So I’m in a newly relationship, me and my ex been broken up for a while. We tried to work things out through these past few months but it did not work out. Finally we just stopped so I started seeing new people and met someone and now my ex s being petty sending me videos of him having sex with girls and liking my pictures with my new boyfriend on social media and he even tried to follow my new boyfriend on social media. What do I need to do about the situation? I tried texting him ( bad idea ) asking him nicely and maturely to just leave it be and stop being petty. He just kept calling me a whore and how my new boyfriend likes his sloppy seconds. Etc.. I just didn’t reply. My new boyfriend is aware of the situation. I’ve told him to just ignore him if he try’s to contact him or anything but I just wish my ex would stop. He is so toxic and so childish. I don’t get why he has to be like that. He said he was over me ? I’m so confused.