Story time!
When I was a sophomore in high school, the guy I was dating was apparently dating another girl in a nearby town at the same time.. I found out of course!
We tried to work through it but I could never trust him again.. even in the smallest little things, so I finally just ended it once & for all.
Moral of the story: It is probably something you will always think about
I'm so sorry to hear about what you're going through! If you want to talk, feel free to pm me