Will my wife get 1/2 of the house I purchased before we got married if I get divorce?

Unless you paid cash for the house and haven't made any payments, improvements, etc. since you got married, at least part of the house has been paid for with community funds, so at least part of its value is community property. She may not get half, but the judge will have the legal authority to give her something if there's any equity there. You need a lawyer to help you sort it out. Good luck.