I've heard your arguments why we shouldn't go for it, and....well, they're bad and I don't like them.
Imagine a romantic comedy in which the protagonist longs for someone for years, hoping that one day they can be with that person. There's just one hitch: that person is in a long-term relationship with someone else. Hope seems slim that it'll ever happen, until one day....it seems a little more likely. And the next day, it seems a little more likely. And the day after that, and the day after that....well, you get the idea.
Eventually, the target of the protagonist's affection appears to be on the rocks with their current significant other, and a breakup seems imminent.