If neither of you is ready to live together and you do so, it can cause problems for both of you. You’ll both get on each other’s nerves and the idea of cohabitating will feel more like torture than a good thing. Also, there is a difference between how a man and a woman relates to living together in relationships. The girlfriend is hearing marriage bells ringing, while the boyfriend is simply thinking of how to deepen intimacy in the relationship before taking the next step towards marriage.