SHARED HOME ONE NAME ON MORGAGE

MY BOYFREIND AND I HAVE BEEN LIVING TOGETHER FOR 10 YEARS. 5 OF THOSE YEARS IN A HOUSE THAT WE PURCHASED. HOWEVER THE MORGAGE ON OUR PROPERTY IS ONLY IN HIS NAME. I'M ASSUMING THAT IF SOMETHING WERE TO HAPPEN TO HIM I WOULD HAVE NO LEGAL RIGHT TO THE HOUSE? MY NAME DOES NOT APPEAR ON THE DEED EITHER. WHAT DO I NEED TO DO TO ENSURE THAT IN THE EVENT SOMETHING WERE TO HAPPEN TO HIM I WOULD BE ABLE TO KEEP THE HOUSE? WE DON'T WANT TO GO THRU REMORGAGING TO ADD ME ON IS THERE ANOTHER ALTERNATIVE? PLEASE HELP - Is this your question? Add additional information