As we like to emphasize, people are not interchangeable. It may seem that if your partner has another lover who is similar to you, or likes the same things you do, then she doesn't need you anymore. But remember, she's non-monogamous and doesn't think that way. She loves you for who you are. Doing something with you is an entirely different experience from doing the same thing with someone else. And if your partner has a lover who's very different from you, it's not a covert way of saying that the different things about you aren't good, wonderful or valuable, or that she wants you to be like
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