How quickly is 'too quickly' to fall in love?

I have been dating a girl for 5 weeks. Two weeks after meeting we were seeing each other every day.

I have been prone to falling easily and I am wary to separate lust or obsession from true affection. She feels the same as me and we have said the 'L' word to each other already!

Thoughts and experiences?

How quickly is 'too quickly' to fall in love?
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