/ How to convince English boyfriend to learn Polish?
It is strange for me to think that he will not even learn to say, please and thankyou etc. For me this is something I would do when visiting any country, just to be polite.
I met my girlfriend whilst on holiday on the black sea coast of Romania, and when I first visited her in Poland I made sure I could at least say hello, and thankyou, especially as I knew her parents did not speak any English. They were pleasantly suprised at the few words I knew, and I suprised her friends with a na zdrowie, when we met at a bar as well.
Since this visit I have started having lessons in the UK, and of course it is very hard, but every small amount learnt, to me opens up doors in the relationship and an understanding, of what I am finding a great culture and people to spend time with.
Perhaps your boyfriend, is worried that he will find the language too hard, but I agree with Softsong's thoughts, and in my opinion when you make the effort, but sometimes pronounce the Polish words wrong and friends and family laugh, it is the best way of breaking the ice and having fun.