She left me for nother guy after 2 1/2 years =''[ im only 16 please help me?

Guys yeah, ik im young.. but i do know what love was! so dont say i dont. we loved eachother.. and i cant stop thinking about her. im so depressed latley and shes like the reason i woke up every morning looking froword to life. she was so beautiful and perfect. im only 16. and idk what to do. im going crazy thinkiong about her. and she was able to get over me so quik!!!! =''[ idk what to do. she was like amzing. but i guess not for me ='[ please help me out.. what do i dooo?? =''[