I think both partners have to decide what they can handle and act accordingly. My current guy had a four year relationship with a woman who is currently his best friend. They broke up close to ten years ago and haven't had any romantic or sexual incidents since then. Now he's choosing to be with me. I assume if they wanted to be together, they would. Of course, if he starts spending a ton of time together and he's acting not that into me, Id probably ask some questions. But I kinda think if he was to cheat or fall for another woman, it would be someone other than her.
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