Not only do you not need to make any decisions right now regarding moving on, you actually should not make them. You need time to sit still and let this all digest. Otherwise you may make an emotional decision vs. a logical one.
Definitely see a lawyer. Protect/freeze finances.
Mine lived in house for 4 years before he moved and so I can tell you depression is the main ingredient. And yes, it is extraordinary what they “plan.” At BD, mine told me he wanted to get an apartment and sleep with other women on Fridays and Saturdays but come home for pancakes in the AM. Seriously. He told me he needed to have women looking at him “meaningfully” and I am sure this was a mommy issue as he was neglected and treated worse than his brother. He was shocked when I outright said no to this plan.
They are not in their right minds, like teens. But, they have access to funds so they can do damage to your life.
You will be okay. Just take day by day. Post often as this place is amazing with supportive people.
Me 41, H 47, M 15 yrs, S11, S13 BD 1: 11/4/14 we work on it; really I pretzel myself BD 2: 3/31/15 H goes down to "dorm room" 8/15: H back to MBR 10/15: H back in dorm room 1/18: H files, now divorced