Our expert says:
Why are you allowing her to torment her partner, and to involve you in deception ? If she is at all serious about this "partnership" going off secrely and slepnding the night away is inexplicable. If she chooses to lie to her partner, that is her choice, even if a bad one . But she is NOT entitled to expect you or your partner to lie to him.
SHe doesn't "have to keep secrets" --- she chooses to do so, and her partner apparently has every reason to feel insecure about her. She sounds very irresponsible, and blamingi everyone but herself for the choices she makes.
Tell her you cannot and will not lie for her, nor help her to cheat or deceive her partner, and neither of you will do that. And tell your partner that you agree with him, and say what you have told her.
Going out with her stepbrother didn;t require her to stay out all night.
And consider relationship counselling for yourself and your partner --- the other couple may be beyond such help at this stage.
And don't attack Anon or other readers who are being frank and helpful, merely because you don't like what they think. And don't add that your relationship is nobody's business --- you chose to include the nature of your relationship within the core of your question.
And the fact that this deceitful woman has been a friend of yours, doesn'tmean you are compelled to defend everything she does, or to obey her every command. That is NOT what friends are for. Friends are there to advise their pals when they are being cruel or unwise.
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