My trust issues re ruining my relationship...

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>Okay, so a little back story.
My first girlfriend used Tinder to meet new people while we were dating, frequently lied about everything she could possibly lie about. She also cheated on me with her drug dealer. As a result, I have some pretty serious trust issues now.

My previous girlfriend didn't even attempt to meet new people while she and I were together, didn't try to make any friends, and didn't even give people who weren't me the time of day. So I didn't know my trust issues were so bad until recently. In my current relationship My current girlfriend has been trying to make friends and has tinder so she can just chat with people and make fun of them if they stupid things. I, in my infinite wisdom, see a tinder thing pop-up on her phone while I'm sitting on her couch and while she's doing something or another in the kitchen and decide to take a poke and see a really long messaging session with some guy. I don't read it, I see it and immediately lock the phone, leaving the application up and everything. She comes back, I ask her if it's okay for me to read through some of them, she says that it's fine and that nobody is really messaging right now, and moves her phone to the table, 5minutes later she opens up her phone to check something or another and sees that the application is open and I panic. I shut down completely and can't think of what to say. She asks me if I was snooping and I immediately say no, and she asks why the application was up then knowing she didn't open it.

I'm stupid apparently, and have deeper rooted trust issues than I think I do, I think...