Legal Question in Family Law in Massachusetts

I'm sorry you are having this issue.

One of the problems you are going to have as long as you are married to this individual is that Massachusetts does not really recognize "separated" as a legal status. I think you will actually find that the divorce process will provide you and your spouse with some structure during the time that you are not quite married but are not quite divorced either.

So long as you are married, and assuming there are no abuse prevention orders in place, you can't generally can't exclude each other from marital property.

If this arrangement is not working - and I can understand why it is not - your best bet is to speak to an attorney about your options.