I’m glad you can see where you have gone wrong. That’s a good starting point. I’m also glad I could help even a small amount.

In getting help, go to therapy. Figure out why you think the way you do. Figure out why things rile you up. Once you have figured out the why you will be able to work on staying calm and not over thinking things.

Firstly you didn’t just come across the conversation you were looking through her phone. Which is a huge issue with privacy. You have no right to read her conversations.

Secondly I can see how you are trying to make this a trust issue because her crush had a gf at the time. But she didn’t tell her crush she just admitted to her friend that when he touched her face applying glitter she liked it. This does not make her untrustworthy. It actually makes her very trustworthy because she clearly didn’t act on how she felt.

And thirdly this is not traumatising. Please look that word up and learn what it actually means. This is you being insecure for absolutely no reason. You may want to work on this element of your personality otherwise being in a relationship is going to be very hard for you