Moving in with someone is easy. I tried it once. After a long, happy relationship, we took the next step and decided to cohabit. Then things started to go bad. So bad, in fact, that we split up and now haven’t spoken in years. So what went wrong? Before moving in together, we lived in virtual cohabitation and spent most of our holidays together, so it couldn’t have been incompatibility. But then we moved in together, one place, one bedroom.