How to stop my cat from spraying?

This is a hard decision to make, but chances are is your partner may want the cat outside, and your cat to mate I guess. That is my feeling as to why he is against you getting the cat fixed. As for the spraying, there is a spray that you can buy at a pet store or from your vets office that has the smell of spray on it, but only cats can smell it, humans cannot. If you get this, and spray it where he normally sprays this might help you.