Are you going to buy her out of the house? If so, you definitely have no reason to leave. You have plenty of time to figure out your living arrangements, no rush to move out in 3.5 weeks. You can always tell your W "I was very upset when I said that, I've decided it's best for me to stay in the house."
or
"I wasn't thinking clearly when I said that..."
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712