How should i tell the girl i like this?

alright so, i took a girl i like (she likes me too) and her friend to a concert over the weekend. The girl's friend, Abby, was like all over me the whole time (we used to have a thing). So last night Abby started skyping with me. We played games just messing around, i was not being flirty at all. We started playing hangman (you type in a word and the other person has to guess it) so for words she put in "sweetheart", then put "sext" two times in a row so i was like thats dirty she put for a word the next time "dirtygirl" and put a wink face in the chat. So i was like yeahhh goodnight and swear to god accidentally put a winky face instead of a smiley. Ummm i want to tell the girl i like that this happened, but dont know if she would believe me, or if her friend would turn it on me because it wasnt saved anywhere and make it look like i was being like that to her. Please help me!!