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How to guard your relationship from infidelity
Talk about cheating.
Especially if you're in the beginning stages of your relationship, be bold in bringing up cheating. Talk about whether you've cheated or have been cheated on, and ask your partner about his or her past.
Talk about what would happen to the relationship in the event of infidelity. For example, if one person cheats, is the relationship over, or is there room to work through it? How have your past experiences shaped your views now? Define your boundaries.