7 months later... why is it that I am still want to be with my ex?

Ive dated 2 other men. One who I am recently seeing his name is Jeff but I dont know how to tell him that I dont like him? I cannot for the life of me ever forget my ex Josh!!! I love him to this day and there isnt one day of my life that I dont think about him. He is happy after cheating on me he is still with that woman. But I cant seem to find the right man and desperately want my ex more than anything in the world!!! How can I get him back? Should I contact him? Text him? What should I say? I love Josh soo very much and just cry myself to sleep sometimes thinking how unfair it is that he isnt in my life. I miss and love him very much. I want nor will ever love another as much as I loved Josh!! He was my first everything and I was his! Please I need advice. & dont tell me to move on. because I cant. The love I have for Josh is greater than anything this world or the next has to offer!