Should I help.

Alright yall I need advice. My son’s dad wants half my taxes. Not just the child credit but half of them ALL. We aren’t together he broke up with me in November because he couldn’t stop cheating on me. I don’t feel like he should get any of my taxes cause I am the full time parent. & he hardly helps. So I am 100% convinced he doesn’t deserve any. But he also claims he needs them because he owes so much so I do feel bad. But he is so good at manipulating me …. I do love him but I don’t think he will ever change… I don’t know what to do here.