What to do about my relationship? How can I stay in control of myself in this relationship?

i would tell her about how you know she has lied before and see what she does. if u denies it and says that never happens after you show her the proff and if u guys are arguing and get in a fight about that then i think u should end it because it would not be good for u guys at all. because being with someone who lies and then when u bring it up and denis it is not good.