Why is my father jealous of my step-dad’s and I relationship?

Anonymous
My dad never took care of me and my mom, and he divorced her when I was 12 ( I am now 19), and he never bothered to stay in touch with me, but 6 years ago my mom started to date a guy, the thing is that he’s 29 while my mom is 39, and my dad would often make fun of them because of their age gap, and would call my mom a sugar mommy ( which is stupid since my step-dad out earn my mom), I knew that my dad was jealous of him cause he’s hotter, and more successful, but what bothers me is that now that my mom’s boyfriend is taking care of me he SUDDENLY started to notice me, he got mad when my step-dad bought me a car for my 18th birthday and taught me how to drive, and he would say that I am breaking his heart by preferring this stranger when this stranger supported me more than he ever did. Why is he jealous of my step-dad’s relationship with me?
Why is my father jealous of my step-dad’s and I relationship?
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