Looking for an excuse to explain the relationship between Gabi and Navarro, without giving Nyx a chance for drama, I came up with a theory:
When observing the photo in Gabi's room, I noticed that they don't seem close, not like a couple, or they would be hugging happily on their wedding day.
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So I think Navarro may have been Gabi's agent when she was an athlete, that's how they met and that's why he was present at her wedding, he was important in her life and may have even been the best man.
Maybe this blonde guy who was with Navarro is Gabi's husband.
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The absence of a photo of her with her husband on the wall can be explained by the fact that she removed it due to problems in her marriage, and after deciding to divorce, she also took the photo with Navarro, as this inevitably reminded her of the marriage and future ex-husband.
In the dialogue between Gabi and Ximena, it is mentioned that the MC reminds them of someone, and I don't think Gabi would want to have an affair with someone who reminds her of her husband, although it is possible.