The more I think about it FS, the more I think that this is a massive thing for you. It's a line in the sand which is done whilst taking into account the dynamic of your relationship. I love a bit of confrontation myself but changing the locks is an unnecessary aggressive move I think. Too drastic and dramatic.

I know AlisonUK had very specific understandable reasons for doing so, but you are not in that position. Seriously, if you in your situation have to use the law to prevent your spouse from entering the marital property, then I think it's a pretty done deal that there isn't anything left worth saving. A history of violence is a different perspective.

Heck even my H respected my request not to be in my bedroom when I wasn't here. He immediately said that if he wanted something he would ask me to leave it out.

Leading a double life with a OW is the height of marital disrespect in my view, and even he didn't disrespect this request from me.

So, It's a request. Technically not a boundary. A H should show respect for that request shouldn't he? If he doesn't, it speaks volumes I believe and may create a response from you far more powerful than any lock changing.

It rather looks like he's tempted to get into a pi**ing contest about house / home, it's mine / it's yours. Don't play. You've stated your request.

Your tone sounds a bit different FS. I think this may be a pivotal time for you. I would love to get hold of him and tell him to stop pi**ing about and see the writing on the wall.