tigerlily, Please get some legal advice as to what you are entitled to.
About the lock...don't do anything until you've spoke to a lawyer. In some areas, clients are advised not to change the locks until all of the personal possessions are removed from the home, in others, a separation agreement needs to be in place, etc. I would hate to see you change the locks and then find out that you shouldn't have done it at this time.
Also, changing the locks may create more anger and tension in your home at this point. Especially if you are living as roommates.
Go on line and check out what the laws are in your area concerning a situation such as yours. At least it would give you a "leg up" on what you are entitled to.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
