My stxh left 2 weeks ago to shack up with new girlfriend and her young son who he'd met 18 days before. I'm taking our kids to stay with my parents over half-term and he's asked if he can stay in our house as he's working in the town where I live. He's moved 90 mins away now. I said no as I don't want him in the house and I don't trust him at all not to take stuff that we've bought together or to riffle through my paperwork. I can't really take stuff with me as I'll be on the train with 2 kids and all our baggage. I know I can't change the locks- my friend keeps telling me to do this - but can I refuse to let him stay?