Mate I so know what you are going through...foodwise ;)

I just went back to the Netherlands first time in 4 years and I missed so much food that 10 days was not enough but many things tasted better in my mind than in reality. But still so much things I am happy to have tasted again.

My GF was here for those 4 years and she went back to as well and came back with mixed feelings, as she is snot so good with languages and shy she doesn't talk much with the Spanish...for her going back felt really great and she is a bit weiry now. She did not expect to enjoy being back that much.

In your case, sounds like you learned the lessons you needed to learn and the good thing is if you don't like it back in the rain Mexico is only a plane ride away and your gf´s mom is a very cool person (based on the interactions I had with her).

So go follow your heart you´re not burning any bridges.