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I don't think you need to show anything special at all. Lots of people have multiple love interests (or hookups) over the course of a novel. In some novels, it's entire the premise. If a chara...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/43006 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43006 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I don't think you need to show anything special at all. Lots of people have multiple love interests (or hookups) over the course of a novel. In some novels, it's entire the premise. If a character's first relationship in the novel was to a tall blond German runner, you wouldn't think your readers would be confused when the next relationship is with a short bald Nigerian physics professor. Let your reader be confused. Most readers will figure it out pretty quickly. The few that don't, well, they're the readers that wouldn't really get it after you explained it either.