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Sometimes it does. And it is a period when you also have more energy to do many more creative things.
However, you cannot impose that as a rule.
As you say, the point is to be happy. In times, you can certainly be happy being alone. But if you meet a girl who makes you really happy, don't let it go. Even if it turn out bad, it won't kill you and you are gonna have more good memories to keep.
In other words, just don't sweat it. Flirting is a natural behaviour and so it should remain.