I’m sorry to hear about your situation break ups are always hard they are never easy but you have to realize you are still in high school and girls at that age make silly irrational decisions they don’t know what they really want yet and I’m sure the time you spent together was amazing and I’m know its hard to get yourself back on track after something like that but you should be more mature about this don’t be angry at her don’t be angry at yourself it’s just how relationships go just accept the situation and move on. You are stronger than your feelings don’t let them control you. I know talking to her might be impossible for a while but the way it ended was not as bad as it could have been she was not actively cheating on you at the time she didn’t just stop talking to you or something horrible like that she explained why she couldn’t date you anymore and went on with her life you should respect that and move on as well no amount of trying to get back with her will ever work and if you think hard about it you will realize that if by some miracle you could start dating again you still would not be happy.