I am unable to give you legal advice, Jennifer, as I am a psychologist and not a lawyer. I can tell you, though, that there are ways for you and your ex-boyfriend to negotiate a solution without a lawyer. For example, you can hire a private mediator to help you determine where your cat should live. Whatever you decide to do, I ask you to please avoid a hostile custody battle by claiming that she can only thrive in your home. Some cats can adjust well to dividing their time between two homes. As you negotiate this, just remember that you’ll create the happiest lifestyle for your cat if you commit to developing a good working relationship with your ex-boyfriend.