In the context of mate selection, attracting someone who is already in a romantic relationship with someone else is called Mate poaching.
Mate poaching is defined as engaging in conduct intended to entice someone who is already attached, either momentarily for a quick fling or more permanently for lifelong mateship. When one spouse successfully attracts the partner of the other with the purpose to begin a sexual and/or romantic relationship with this person, this is referred to as successful mate poaching. Poached relationships typically aren't as good as their non-poached counterparts.
Mate poaching is a typical tactic used to establish dominance and control. It's a strategy used by those who are extremely insecure, lonely, and envious to "poach" appealing men and women.
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