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How to stop an affair
Assess both relationships privately.
If you've been seeing someone on the side, you might be experiencing a great deal of confusion and grief over the process that awaits. A great deal of trust has been broken with your committed partner, while you also need to take the other party's feelings into account.
Every relationship will be different, and it's important to evaluate both separately before planning a course of action. Consider whether or not you should talk to your committed partner, or the new partner first.