Fair Game (2005)

Co-workers Michael and Stacey can barely be civil to each other - even at the office. So when Michael is suddenly evicted from his home and the two are unexpectedly forced to become roommates, neither party is thrilled with the arrangement. They eventually learn to like each other and are especially surprised when an undeniable attraction forms. However, another man arrives on the scene for Stacey at the same time, complicating things further.