Originally Posted by
IndiReloaded
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Think what you want, but the socially accepted sign that someone is unavailable is that they are married, or an equivalent form of commitment. Like CB said before, if you want a 'guarantee' someone won't leave, then get married.
Other than that, its "All's fair in love & war". You don't have to like it, but to my knowledge, noone has ever won an 'alienation of affection' suit for someone they weren't married to.