Should i try to get my x back or let the new guy take her????

shes broken my heart 3 times ive taken sooo much for her and weve been going out for 8 mounths but last sunday my phone broke and she called and called and since i didnt ansir she tought i didnt want anything to do with her and found a new guy...after everything i did for her{spent alot of money,family dissoned me,didnt have with anybody else the whole time,and was the sweetes guy alive....but now shes with that new guy but sayz she still loves me and wants me back but i just dont think i can take more heart break...what should i do fight or flight??????