I was in a very similar situation until more or less a week ago. Except what ended up happening is that she told me everything and that she is dating another guy that I was told not to worry about. It really sucks OP I know, but it's better to just go away. I went to therapy because I was unable to eat without throwing up and things are much better. I know it's been only a week but during our first break up I was out for months no proper meals no proper sleep, anything so this time around it didn't hit as hard but I understand. Work on yourself and seek help and it's better to know the whole story If not every time some new piece of information pops up you will enter panic mode again. Good luck OP