She would come over and do laundry or hang out on the weekends, or sometimes stop by in the afternoon when I wasn't home.
I let it go for a while to see how things played out.
When I finally put a stop to it she became angry at first.She would say it's still her place and if she's paying for half she could come and go when ever she wanted to. I would tell her I understand, so if you want to stop paying for half, feel free.
I tried not to get upset and just calmly tell her what I could and couldn't handle. I made mistakes though.
She did test me.
We were still married so I couldn't legally change the locks or anything like that.
I got creative. The screen doors seemed to lock themselves and the darn code for the garage door happened to get changed.
She tried anger, then she would be nice. She did finally get the picture.
I guess the most important thing is that you look out for your well being. Don't let your fear of losing him keep you from doing that.
Just be kind, be honest to yourself and him, and be firm.