I've been with my girlfriend 3 months, and I kissed another girl.

jamiemilne
we've been together 3 month and last night I ended up in a friends house who happened to be an ex, and we kissed, should I tell my girlfriend ? or keep it from her to avoid hurting her as she's never going to find out
Updates
+1 y
as I love my girlfriend and know that I want to be with her, this kissing lasted no more than 20mins, is it worth ruining a relationship over /?
I've been with my girlfriend 3 months, and I kissed another girl.
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