自分の別荘に招くのは、腹を割って話したいからだろうか。って英語でなんて言うの？

「自分の別荘に招くのは、腹を割って話したいからだろうか。」= "I wonder if the reason he invited him to his private villa is because he wants to be able to speak frankly and unreservedly." 腹を割って話す　＝　speak frankly and unreservedly; speak candidly; have a heart-to-heart talk だろうか　＝　I wonder if ...