You’re co-workers so if you broke up, you’d need to find a new job. You live together so if you broke up, you’d need to find a new place. You share all the same friends so if you broke up, you’d need to make all new friends! It would be a real hassle to make all of those changes but the fear of doing so should not be keeping you with somebody that you do not want to be with. If you’re doing that, you’re similar to the person that fears being alone—you let your relationship determine who you are.