ive been with my gf, Kim for about 3 months now, ive known her for 5 years though, we are doing this no sex thing for 2 weeks to see how well we can do, but last night after a few drinks, i got talking to my ex gf, who i dont even like, i told her about my gf and what we was doing, and somehow she managed to work her way round here, and we kissed and was going to other stuff..but then i realised what i was doing and said no, and that was that, but now i dont know what to say to Kim, shes not had good experience with cheating, and i know it would really depress her if i told her, but i have this feeling of guilt which is gonna kill me!! what do i do, tell her, or just forget about it...and yes i know i was stupid for doing it