I'm sorry to hear of your dilemma.
Cohabitation is a living arrangement in which an unmarried couple lives together in a long-term relationship that resembles a marriage. The share the expenses of the household (meaning that there is a financial benefit to your ex) and share sexual relations as well. They hold themselves out as a couple.
To prove cohabitation, you will need to show that your ex is residing with another person, sharing household expenses and that they are holding themselves out as a couple. While the proof of sexual activity can be difficult to prove, it will generally be presumed when the other factors are proven.
I wish you the best in 2011.
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