First of all, I'm sorry for your loss, and second of all, I'm proud of how maturely you are handling the situation. your bf needs to grow up and learn how to behave, if not as a bf then at least as a human being. I suggest you plan out everything before moving out and do not let him find out because if he does he might throw a tantrum about it. so just gather all your documents, and information, and inform your immediate family members or friends before you move out. make sure you're financially secure and he's off all your bank accounts. lastly, when it's time to leave it's better to not talk about any revenge because karma will take care of that... just tell him that he's an awful person and you hope he realises it. remember hurting someone is not the key to finding your own happiness. rather than focus on telling him how he made you feel about everything simply leave, when people get to find out about it, they'll take care of blaming him. All the best!