Would travelling with my bfs parents to their vacation home be a nightmare or a wise idea? why would my bfs mom say this?

My bfs parents bought a tropical vacation home out of the country ( in the USA) and my boyfriend and his dad were both telling me to get a passport and I did.

My bfs mom originally told me and my boyfriend that I could come down South with them next year in the fall but now my bfs mom told my boyfriend she doesn’t allow me to come because we’re not married and I’m not her daughter in law. My boyfriend got pissed and told her that it’s serious between me and him and that we’re together for 3 years already and she said that’s their rules and their house.

why did his mom change her mind about me coming togther with my boyfriend if she likes me so much?

( she’s always hugging me and she bought me a very generous bday gift as well and she always feeds me. I also always come to his family get togethers and always have bought gifts for my bfs nieces and nephews as well).

Not recommended / explain why
Good idea
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1 y
Is my bfs mom trying to indirectly encourage her son to marry me?
Updates
1 y
His mom always hugs me and got me a generous bday gift as well and she’s very caring warm and welcoming towards me every time I go to her place.
She was also concerned about me when I was injured as well
Would travelling with my bfs parents to their vacation home be a nightmare or a wise idea? why would my bfs mom say this?
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