Should I cut ties off with my dad permanently?

So I met my dad when I was 18 I was the one who reached out to him. And if it wasn't for me me my brother or my mom would have never seen him. Long story short he told me when he was either high or drunk. That he didn't care and he purposely left us and all we are to him is just a thought. So I left now 4 years later I still have him on Facebook he tried apologizing to me by telling other people. That we had problems when I never spoke bad to him or told him anything bad. It was just out of the blue. He thinks I don't know what he told his side of his family by makin up lies and saying that all I did was talk badly about family members I never met. He tried saying Hi to me on Facebook a little while ago. I just said I'm good and that was it. But now that he knows I'm in school to become a police officer he continues to try and speak with me. I don't care for him at all. Should I just delete him off Facebook and his number. Because now that I'm older and see everyone who's my age with basic things that people take for granted like food and shelter. I don't have or struggle everyday to obtain these basic things. Food especially, and he has other kids who are not his and cares more about them and had bought them brand new cars and one a house already. What do you guys think? What he said to me is what you would hear about a low life scum bag deadbeat true intentions are. Thanks everyone.