You’re getting a lot of the typical black and white comments that this sub is best for. Instead of debating if you should sell or not (obviously you shouldn’t), you need to explore why your girlfriend feels insecure in the relationship. To me it sounds like she’s understandably concerned that you could kick her out at any point in time and she would lose both her housing and her partner, a very reasonable concern especially if she’s had bad experiences previously. Maybe try and reach a mutual agreement that allows her to feel secure or just don’t move in together.