Tell me WHY?

I've been married for  better than 7 years and it's been a real rocky road. My husband seems to think that everything we have gained together is his.....as in divorce papers he singles out things that are his and things that are mine...How can they do that being married I thought that once you became married what you gained together was an ours situation. Any one have any clues on how to catch someone trying to say things aren't his and being able to get them for purgery? I mean in the beginning of this argument he left and became very abusive to me and still is trying to say that I am taking away what is his.. Just because it was here before we got married and it was his parents home....when we married our wedding present was our home. So why do I have to leave? I'm hoping that the lawyer I got is good enough to get me my home and some spousal support I am disabled and can't do much and when he left that was my only source of income. Any one got any clues or suggestions that may help me. I really don't want a divorce but he's playing little games that hurt to bad so if this is what he wants i'll give it to him with the acception that he claim what we have together as our property.. not his parents....HELP IN MICHIGAN.