Legal Question in Family Law in Michigan

No. You get no interest in his estate just because you are his girlfriend.

-Tom

It sounds like your situation is complex. First, he needs to meet with his prior divorce attorney to remove his ex-wife's name from his property. After that's done, he should ask the attorney to properly draft a will so that he can determine in advance whether he wants to leave part of his estate to you.

If this is not cleared up IN ADVANCE, it is likely there will be a huge mess to clear up when he dies.

Fully agree with the other two attorneys. Heavy duty estate planning and getting an ex off a deed is huge to make this right.