Lying To Someone?

So my partner has been texting their friend saying that their not in love with me and they're sure I know this already. They have no clue I saw this. When confronted they said no they love me and that their just under stress at work. Theirs a lot, a lot more to the story. I just dont understand it. Why lie? What should I belive? I just dont know anymore...
Lying To Someone?
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