Fizzy has called it.
Don't ever stay with someone who watches you be disrespected and laughs. Who takes part in making you feel bad, and is fine with it.
And yes, it's not to do with the meme or nationalities.
It's making your partner feel like an idiot and a loser while you respond to someone in a private language. In front of them.
I'm constantly in bilingual and trilingual situations and I know that the most disrespectful thing is to exclude anyone. And I also know that even if they don't get the words, they will feel and understand the energy of others.
A Polish wife would not tolerate her husband exposing her from conversation with another woman like that. After she had spoken to him in private, he would never speak to that woman again.
OP, I've been there. Of course one can't generalise, but a lot of Polish men are used to a strong matriarch and need to know where the boundary is. It needs to be made explicit.i was warned by Polish MIL to send him to Coventry and not look at him for a week if he over stepped.
I was appalled and said no, he's an independent adult with his own moral compass. I have to trust him.
But she was right. He was like a dog. If you let them get away with it, they will.
So not my type at all. I got there in the end. If I need to show him the whip and go out of my comfort zone to make him behave well, then he's not for me. I'm not a dog trainer.
You have to tell him it's not in and makes you feel upset tone excluded like that. See how he responds.
He needs to respond well. Be heartbroken he's hurt you. Say omg she's just a Polish friend but sure of course I don't want you to feel jealous. And stop talking to her.