My ex kissed me and I feel guilty about it, should I tell my boyfriend?

well I'm visiting my parents so I'm away from my bf, I met my ex and we talked and refreshed some memories and everything, we went out for almost a date, he held my hand hugged me and I was trying to get away, but then he kissed me and I did kiss him back for like 2 seconds then I stopped, and I still feel guilty about t and I dunno if I should tell my boyfriend this or not, I don't wanna loose him, I love him I do,
My ex kissed me and I feel guilty about it, should I tell my boyfriend?
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