On the third day should I tell her that I like her so much?

So she came in the evening for workout one I approach I keep conversation simple so it's been 5 day in between 5 days I talked her like 2 times 3 time just hi bye.. should I tell her that why I approach her (and tell her I like you so much ) or what should I do

On the third day should I tell her that I like her so much?
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