Relationships

Ill try to keep this simple I met a girl at work a few years ago, now we work other places but after dating and now living together we have had issues where I found she had a POF dating account it had no pics or messages on it but claimed she did not use it. She has ex boyfriends the still text her on Facebook but never seems to claim me or ask them to stop being some messages are at 2am unless I say something to have it to stop. Now another dating site was on her history of her phone called wellhello.com I clicked on it but just said it was a deleted account. I made a account to see if I could find her and let her know I did and she is flipping out because I was looking and tried to blame me for being on there lol. She yells a lot and always leaves or goes to bed every time we argue. Keep in mind I'm not angel I have yelled back and sometimes gave into this form or arguing. But being calm or whatever her way is nothing works. In her defense I have had a ex contact me but I told her right away and asked her not to call being crazy but its almost like she insisted to be immature and call people,and blamed me for two days that I was lying to her and possibly hooking up with her even though I let my girl know I thought I was doing the right thing. We are starting to fight a lot because she feels I should not think all this is weird and I feel lost. I want to trust someone but not be ignorant at the same time.