What do i do if my ex is being a jerk towards me after he broke up with me a week ago.

My ex and i broke up a week ago and it was a mutual thing where him and i just lost feelings and he broke the ice.

After, i decided to move on with my life because I don't really have a connection with him anymore so i have no means in talking to him, and plus i remembered bad stuff he did in the relationship, so I just don't anymore.

But now he's asking why I'm not talking to him anymore, instead of talking to him about it because I don't want him in my life i try to just enjoy my life, smile and laugh because life is short.

Then he's just acting like a huge jerk now for no reason. He would text me mean things then i would stand up for myself then he would be like "whatever" then i leave him on read then he comes back.

He hurt me, and now i just want to show him what he lost and that i am content with my life without him.

But I don't know how