I fingered a girl after being dumped, but then got back with my GF. Do i tell her?

you didn't do anything wrong, but dont tell your gf...if you do, she could possibly think that you didn't ever love her, and then instead of her being the bad person for breaking your heart, your the bad person for doing that. as much as i am for honesty in relationships, id say take that one to the grave...and hope that the other girl has a teeny tiny mouth, and doesn't say anything to anybody. but if you think that the girl will say something, then maybe you should just come forthwright with the info, cause in the long run youll be screwed with that. goodluck!