I don’t think my boyfriend daughter likes me

Whenever he’s not around (he’ll be in the gas station or ran in the house for a minute. Or we’ll already be sitting in the car) (she’s 6)

She’ll start saying mean stuff

“I should kick/hit you”

“You get on my nerves”

“Your in my mommy/daddy car , you can get out and walk”

“My daddy already has a girlfriend, so you can stop talking to him”

One time before she said “you could come to my birthday party , but my mom don’t like you”

I just say “ok” , it’s no need to go back & forth with a 6 year old ,

I know it’s nothing serious , but that stuff do hurt. who is she learning this stuff from and what did I do to get talked this way.

I don’t have any kids , I Don’t act like a step mom. I don’t tell her what to do. I don’t be affectionate with her dad Infront of her.

The most she’ll see is holding hands and sitting very close. I don’t have no place to act like a mom.

I know that sometimes the mom would ask the daughter about certain things and the daughter would tell. But I don’t know the exact words

That’s just what my boyfriend would tell me.

Any ideas on what to do ? , I’ve always thought this was a Tv thing , where kids would sabotage their parents partner but it’s a real thing, should I record her next time and show him. ?

Should I tell him , should I leave it alone ?

I’m 24.