The answer to your question depends on several factors including the wording of your order for spousal maintenance. In Colorado, spousal maintenance is not usually stopped as a result of someone cohabiting with another person or being pregnant with someone else's child, unless they marry. If your ex-wife is holding herself out as married to her new partner, that may be grounds to assert a common-law marriage claim and terminate maintenance. Additionally, if there is a clause in your order for spousal maintenance that allows for termination based on cohabitation, termination may be a possibility. A skilled family law attorney can review your order for spousal maintenance, discuss with you what factors are considered when modifying spousal maintenance, and answer your questions regarding common-law marriage.