Ladies Help!!!?

My gf recently left me for a olympic longjumper!! My confidence is shattered. I am 19 years old. I'm 5ft 11,suttly spiked brown hair with big brown eyes. I "apparantly" have a nice smile. Im medium built and due to my line of work (fitness trainer) have quite a toned build. I have two tattoos. (not gruesome). Most say i am a very good looking bloke. I do have a slight temper but i would never do anything like strike a girl! I truly can't understand why she left. Im heartbroken. Shes given me no answers. Am i complete idiot for caring?