Okay everyone seems to have good insight and I will make this short and snappy.

girlfriend is out of town, she was out late last night w/e that is cool, she texts me about 4 am and says she is at some girl A's house or something but then she had to go cause she was leaving to go to girl B's house...who she was with..

okay so I saw a message from girl B to "random friend" and apparently they were never at girl A's house...

they went some dudes house and then some chicks house then home...

now I dont know if girlfriend was with girl B or not like she said she was..I am going to confront her about it here in a few hours...anyone got any good ideas on what I should say? It is obvious she lied to me, but I wonder what she was really up to..also I was sneaky about seeing messages and so I cant use that as evidence against girlfriend but I know shes lying out her ass...probably was with some dude but I want her to admit it..how the **** do i go about this one?