Consultation with the Rabbi

Hello Rabbi. I am a student at the Hesder Yeshiva. And I live in its boarding house. I manage to cope well with the fact that my cell phone is not filtered (I have never vandalized) and today I miraculously discovered thanks to an app I installed a few days ago that while I was charging my cell phone and leaving the room.. another student who knew that the cell phone was not filtered took it and viewed hacked sites. Apparently it has been like this for 3 months and I am sad and have deep sorrow that I am responsible for all the vandalism that has been done for 3 months. I changed my password of course. I ask the Rabbi to please give me some kind of receipt in order to try to fix what I have vandalized ……. What does the Rabbi think about fasting … Thank you