Why do he disappear and not talk to his kids?

We have two kids together under three. The last time he spend time with them was the 24th of Oct. Than he asked on the 4th of this month if he can spend time with them that day. I told him that we was over my grandmother house and just let me know early next time. I haven't heard from him since after that. He don't even pick up the phone or nothing to check on them. The one year old just started walking.. and I recorded the video... should I send it to him?

Why do he disappear and not talk to his kids?
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