We investigate which partner of a 2-gender couple moves out after separation. We test hypotheses on the impact of differences between the partners in the costs of moving out and resources, using data from the Divorce in the Netherlands survey (N = 1,537 ex-couples who separated between 1972 and 1998). Ex-partners initiating the separation were more likely to leave, as were those for whom a new partnership was a reason for the separation. An ex-partner with custody of children was less likely to leave, as was an ex-partner with more resources. A woman was less likely to leave when the joint children no longer lived at home or when the partnership had been longer lasting.