If a guyfriend kisses you and your in a realationship but you dont kiss him back cheating

Okayy so my BEST FRIEND kissed me on the lips! I was in complete shock so i just stood there. I didnt kiss him back i tryed to push him away After he pulled back i clearly stated i was engaged and very very happy with my boyfriend/fiancé i also stated that if he wanted that type of realationship with me we couldnt be friends anymore ... is that considered cheating

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