He doesn't care for our kid nd calls me crazy (messages included)

The father of our child has never seen our child in person because I left him when pregnant.

The story :

He told me to tell him when I get a boyfriend , then he gets a girlfriend without telling me.

We are seperated waiting to get divorced.

He moved in with his girlfriend and is raising her 2 daughters like his own.

I stopped making an effort to talk to him for 4 weeks and not once did he try to communicate me, not even about his child.

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SIDE NOTE.

He never posts on his Snapchat but while me and him has this conversation he posted a photo of him hugging his girlfriends leg while playing the xbox.

All while saying he doesn't want people in his business? Knowing I always check my snap

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REMINDER

for those who are saying I'm making my son be the used in fights I'm not!!!

All I'm doing is reminding him that he has never made an effort despite all he says. He could go weeks without making any effort and DOESN'T PAY CHILD SUPPORT.

What should I do?