Any action that is done three times consecutively is assumed to be a promise (neder)/permanent habit unless you determine ahead of time that it should not be (you do not need to say so out loud, just think it).
Note The principle that doing something three times is considered a neder only applies to a good custom (“minhag tov”) or to a mitzva.
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I just read this halacha, CHAZAKA/THREE TIMES, at I think you will find it very interesting.