ExP moved out around 18 months ago. He'd had an affair and then depression (because that excuses everything you know), then sat around feeling sorry for himself for six months, keeping in contact with OW (half his age), resenting me for messing up his chances of a relationship with her, and doing fuck all to mend our relationship. I had to beg him to move out, which he eventually did. Usual mid-life crisis stuff, all boxes ticked.
He continued to see OW for a year or so, but it turns out she wasn't the live of his life/soulmate after all, and it's petered out.
Now he says he can't afford to keep paying rent and is going to move back in (he's not asking me, he saying this will happen when his rental contract runs out next month). We'd originally agreed to sell the house (jointly owned) and split the proceeds but since moving out he has refused to engage with this at all, to the point of saying that he is not going to sell.
I really don't want him to move back in. It's not that big a house, and he is overbearing. We have two DC and separate lives won't be an option.
Is there anything I can do to stop him?