ANWSER OR ULL DIE TONITE! no really i just need help like now!!!!!!!!!!!!!!!!!!!!!!!!!!!…

my gf and me hang out every day note:all this ppl r 13 and their names r shane (me) cindy and brittney ok well my gf came over today and we were making out ad messing around and stuff well brittney came to my door bc me and her hang out everyday after cindy leaves so i told her to come bac after i walked my gf home so i wet bac upstairs and i caught cindy telling me she wants to leave so i walked her home kissed her ran home bc i had forgot to put the dogs out and didnt want them getting in anything so brittney caught me running home and ran after me and came to my house and saw that there was a bra lying on my bed and britney said "SHANE do not tell me u had " i said "o hell no" i found a note from cindy saying "y r u cheating on me but not just cheating having ! txt me later we need to talk" so she called me and i was lying i my bed with britney laying next to me and we were tlaking and my gf called me and sounded really odd what should i do? idk how to go on about this