nobody here remotely fits any of those descriptions you try to use.
Or in other words,"I could deny it if I liked. I could deny anything if I liked."
― Oscar Wilde, The Importance of Being Earnest
the issues she has with her unfulfilling partner are more likely to be something specific to him at least as much as the place he comes from.
Utter nonsense. As usual with all these agony aunt threads the "guest" stages everything where "she" describes "herself" as the victim whom everyone should sympathize with while "her" Polish male partner is a complete failure whom "she" only wishes "she" could do something and make him change for the better. For "both" of them and the sake of "their" relationship, of course. How very nice of "her."
Since we don't have the Polish partner's account (we never do in these anti-Polish hit pieces) then he must be given the full benefit of the doubt and therefore the "guest" poster's explanation should be the focus of attention to see how badly "she" has failed to hold up "her" end of the relationship.
no matter how much she tries to work on it, the only work that can ever be a success is to adjust her expectations.
I already said "she" needs to look long and hard in the mirror. The adjustments "she" needs to make is to tell "her" Polish partner "she" knows that "she" hasn't done enough to live up to his expectations.
"She" needs to tell him that rather than respect him and talk to him privately "she" took to the internet to rally strangers in the hopes of finding a release for "her" pent-up resentment towards him and turning an agony aunt rant into yet another anti-Polish screed.
"She" still owes him an apology and an expression of gratitude.
The Polish partner should then take stock of "her" attitude and conduct and then do the right thing and dump "her."
I'm lucky, having found my soulmate long ago. Never a cross word between us, ever and every day as good as the day we met.
Never? Ever? Nah, you're not believable.
Only some crank who talks to house plants or is an obsessed cat owner would make such a ludicrous claim. Nice try, but in the real world advice regarding those sorts of relationships are not transferable to the human variety.