I'm thinking of checking my girlfriend's phone while she was out with no ill intent but stumbling upon several text threads with other men planning nights out to cheat on me
Did you already go through her phone then?
I found not only the kissing pic but the location map she drew for her next destination.
I do not think that you should have gone through her phone, but I am glad you got your answers. It is wrong to cheat, so I understand why you would be upset.
I got upset and showed her what I saw. It's always good to get dirty laundry out in the wash.
Well it's horrible for her to do this to you and I hope now that you know the truth that you will break up with her and move on with your life.