Girlfriend demands spare keys to her boyfriend's house

Many may say, dating or engaging yourself in relationship is a win or loose. Most relationships were build on trust and some were broken because of trust. Giving your girlfriend a spare key to your house isn't bad but you do that only when you trust her enough and when you feel comfortable enough to do it. If that moment never comes, don't ever give her key. It's not an obligation and you not giving her your key doesn't make you a worse boyfriend.