My girlfriend went through my phone and found screenshots from Instagram of othr girls, and now she doesn't want to talk to me anymore. What can I do?

I didn't cheat on her and I love her with all of my heart, but because she says she is not ready to have sex, I found myself quite often gathering fap material in order to satisfy my needs. However, no matter how I tried to explain the photos to her, she just kept on crying saying that I used her, just because she didn't have a boyfriend, and she accuses me of having a crush actually on another girl, which is not true. I tried calling her today and she doesn't answer my calls.

What can I do to regain her trust? I know very well that I was in the wrong, but I don't want to lose her.
My girlfriend went through my phone and found screenshots from Instagram of othr girls, and now she doesn't want to talk to me anymore. What can I do?
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