The plan was that when we got engaged my bf's brother was going to move out. That was 3 months ago. His brother is still in our apartment. I've brought up the "deal" but my bf says just to give him more time. Grrrrrrr! Now what?
Have him define "more time." Insist that he keep to his word. Clearly, his brother has used up his welcome. You don't say if there are extenuating circumstances, so consider the whole picture before drawing a hard line.