Is it possible for you and he to go for some couple or family counselling? 15 years is a long time together. Maybe there are some issues (from his point of view) that he would like to be addressed (but he hasn't found a way to communicate with you?)? Is there something that he wants changed? From your point of view - are there some things that you want changed; and how would you like things to turn out? In your place of residence - is your name on the title? Do you need to speak with a lawyer? If he is leaving, how will you support yourself?