Once like her

Two of my very good friends got together and one fine day, the guy broke up with the gal cause he likes another gal. Obviously, he gave the lame reason of they are not compatable when he broke up with her but he told me abt the gal that he liked...I did not tell my gal friend abt it cause well I promised the guy I wont tell her and i did not want her to be further heartbrokem..But he told her abt it eventually when she kept pestering him and even told her that I knew! I felt like an idiot!!! Luckily my gal friend understood my position and we made a pact not to ever lie to each other (or omit any information!)