<human>: Give me a shortened version of the text

I've been dating a woman for months and, the whole time, I have felt periodic bouts of insecurity, ranging from nagging doubt to chest-tightening terror that something was up and that the relationship was on the way to crumbling. There were a handful of events or things that she said which triggered these reactions, but I know that I am bringing a lot of insecurity with me from previous relationships and that, if I hadn't had those experiences, the things that she said/did would maybe have (and certainly should have) rolled off without a thought.

Anyway, last night I was at her place. She went to jump in the shower and she left her phone next to me on the couch. Over the weekend she had made a couple of comments that had me looking for trouble, and yesterday morning she received an early text message where she didn't disclose the sender. Anyway, I was suspicious and insecure and....I picked up her phone, typed in the passcode, and jumped into her text messages.

I didn't read any of them, but I did look through them to see who had texted her and when. I was immediately relieved to discover that nothing looked at all shady, all the way back to before we started dating. I then realized that she could have deleted any shady text messages and went right back to feeling insecure, only now I have a layer of guilt over the top of that insecurity because I took the low road and violated her privacy.

She is a private and introverted person, but every day that goes by she opens up more and is more affectionate and decided about our future. When she talks about our future, she says "When" far more often than she says "if". I have a good thing going, and I don't want to lose it--but my fear of losing it is in danger of screwing it up. I have a few questions:

a) Should I tell her I looked at her phone? I'm leaning towards not telling her.

b) How can I be less paranoid about her dissolving the relationship?

c) How can I be transparent about my insecurities without those insecurities becoming a turn off for her?
<bot>: I looked at my girlfriends phone, found nothing, and feel guilty. Should I tell her and how can I stop being crazy enough to want to look?