Probably could get the $100k back as pre-marriage assets.

Need sharp attorney to negotiate this as if she had nothing 5 years ago, she may want alimony on top of house sale proceeds.

Maybe if you can keep house ( assuming it will appreciate, like location, or have kids etc.) and pay her $150k ( Sale less husband pre assets then split remaining) you will run out of cash flow to pay alimony 😉 Total long shot.