When will you do after you cheated on your boyfriend?Hide or tell him the truth

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Maybe you did it by mistake,wine or physical need.But you still have to admit that it is cheating. You feel so gulity,every time you see your boyfriend, everytime he looks into your eyes, everytime he says I love you, it just make you feel more guilty. Should I tell him? "Abosolutely No." Everybody tell you not to do that. But you just keep it anymore,it's so hurtful.