It's never right to cheat, but once she knew and stayed with you she made a choice to forgive. It is hurtful to be cheated on but its obvious Kristen is going to spend her life and yours making it miserable. Checking your email, drilling other girls, crying constantly about every rumor cannot be any kind of life to lead.
At first I really did believe she cheated because anyone that harps so much about it usually does it. It's just that Jax's lies about anything to tell Stassi what she wants to hear. Remember also that Stassi used Kristen's phone to text Jax to trick him about Kristen so thats the text Jax showed you.Could be???
I also figured something else that might be going on. It seems like the more drama around Stassi and Jax the more air time they get. The are trying to become actors?? They are on TV??? They strile me as two people that will use or do anything to get ahead.