If you've ever been wronged in a relationship, it's hard not to apply the same suspicions to future relationships. It's really easy to get carried away in spiraling thoughts that might even cause you to act irrationally. So irrationally that you might even appear to be a little bit crazy. Demon mode activated.
There's no logical reasoning that shows any success in relationships where there is mistrust, but why's he texting other girls? Oh she's a coworker? Prove it. Spiraling out of control mentally is extremely easy to do. One minute you love you man, the next minute you're crying and giving him an ultimatum. Love is complicated, isn't it? Perhaps you come off a little scary or a little mean, but honestly what are you hiding on your phone anyways? Why don't you just show it to me if you don't care, huh? SHOW ME THE PHONE