Should I allow my ex back in my children’s life?

I have two kids and my exhusband got up and just left me with the kids right after i birthed my second child. He never called or asked about them he did not invest a dime towards the kids he essentially did nothing at all. He called me and apologized and left. He now has a new wife and a kid and he is asking me to allow him back into their lives. I am just baffled he left me and claimed he wants no kids but had a kid with her the same year. He is now claiming he was a young fool and wants to fix things. I obviously hate this man but i don’t want for my hatred to blind me and take away the opportunity for my kids to have a father… what would you do?
Should I allow my ex back in my children’s life?
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