The lands Hitler wanted had almost no Germans living on them. The areas with few Poles were actually the areas the Russians took as their part of the Ribbentrop-Molotov Pact. Germans made up 2.3% of Poland's population.
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With the Sudetenland Hitler almost had a valid claim. There were three million Ethnic Germans living there.
The main reason why the Allies (not including the US, we weren't really involved) told Poland to stand fast was because Hitler had already betrayed them when he completely dismembered Czechoslovakia.
Actually, if you read
Mein Kampf, Hitler always wanted a reckoning with France. (In fact, Von Ribbentrop and other diplomats spent a lot of time downplaying
Mein Kampf. Come on, the man spent four years fighting the French and was grievously injured by them.
Now, one could argue that Hitler was perfectly fine with the British Empire controlling Africa and the Middle East while he controlled Europe, Japan controlled Asia, and the US controlled the Americas. (In fact, Pat Buchanan made this very theory in "A Republic, not an Empire". But this all involved trusting Hitler.
who you know, was... Literally Hitler.