I won't show my girlfriend my phone, but I'm not hiding anything?

[Forget]

It's like tug-of-war. She is pulling at one end until you've let go & fallen, and you are still pulling at the other end trying to hold on. You two should be on the same side pulling together as support[a team]. Who is going to win this.? No-one wins nor loses. Does not matter. Rather it shows strength to the ones that tried.
She can't trust you 'cause she over thinks you, yet she aspects you to trust her.? Rather she is trying to make you feel the range she has inside. Her texting guys, sending guys her photos,flirting with guys, etc. but yet she cries,gets jealous, mad, etc.
I advice to end the relationship before she does. If she cries about it just let it be..later she may go back to her same routine.