I am extremely jealous of my boyfriends 17 year old daughter? HELP?

Anonymous
My boyfriend has a 17 year old daughter who is not biologically his but he raised her. She is basically his ex step daughter.
we got into a fight about her today because he bragged that he would put out money and fix the car he gave her but would not put another dime into my vehicle so I said why would you do that for her not me. He said because she's my kid, you're not.
We have an equal partnership I'm not supposed to care of you. I said but I'm still the woman you love. He said but I love her more. That ruined my day.. I am still pissed now. How do I get over hating his kids?
I am extremely jealous of my boyfriends 17 year old daughter? HELP?
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