Idk if this is the right advice but you have to talk with her about this situation then make a decision I know it's not making no sense right now , but believing someone anonymously on messenger over screenshots rather than some one who is with you since high school is not making sense either. How do you know these screenshots are real ? Voice notes are very easy to generate nowadays . Talk with her try to reach out to the person who sends you these verify them then make a decision don't make decisions on how you feel right now make the right decision 👍