I'm sure I've read somewhere that you cannot just change the locks to keep a marital partner out, but this is slightly more complicated.
My friend lives in a house owned by her and her exH. It was an amicable split, he's happy for her to stay in marital home so the 3 kids are safe, etc.
Fast forward a couple of years. My friend meets someone. They wanted to get married etc but he wasn't earning enough to buy a house with my friend, so it was agreed by all parties that he could move into her home. They've now been married just over 4 years.
Last month he just dropped a bombshell that he was leaving. Various reasons given but it's pretty final. He moved out 2 weeks ago. Last night she got home from work and is fairly certain he's been in the house. Her private papers look rifled through, some drawers have been moved about etc. He has some belongings left in the house, which he will collect when he has rented somewhere, but did agree to contact her first. They're still there.
As there was violence involved in all this, she's now worried he'll come back when she's there (there's been threats)
So here's my question, as he voluntarily left, and as he doesn't have any stake in the house, is she allowed to change the locks?