Are language differences a big problem in relationships?

My boyfriend works in the country I live in. But he doesn't speak any other language than French and doesn't want to learn it. We speak other languages but my family and I can at least speak English with him and his family but they don't make any effort. I don't speak French very well either and it's going to end up in a separation. Aren't language differences really a big problem in a relationship?

Are language differences a big problem in relationships?
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