OUCH!!!! I'm so sorry, Azure. . . it really is a crummy thing to do!
Can you identify what brought on this bought of spite? What transpired btn. the nice relaxing time & the next day's email?
I do suspect he is acting out of anger & helplessness over his brother's death, but that doesn't allow him to take it out on you.
You have been a model of grace, caring & good friendship. And nothing he says or does can take that away from you. Don't give him the power to pull you down. If you must protect yourself by going to an attorney, do so. Don't hesitate - YOU must look out for #1, which is you...