I'm sorry if this sounds insensitive but let's think about what you wrote: "I want him back so badly and he told me in the near future when he wanted a girl he'd definitely think about me again."
"... he told me in the near future when he wanted a girl he'd definitely think about me again."
Try this exercise: in that statement, replace the word 'girl' with the words 'baseball glove,' 'pair of tennis shoes,' 'MP-3 player,' 'car stereo system,' or whatever.
Try replacing the first 'me' with (insert name of particular retail outlet); and replace the second 'me' with (insert brand name of particular object: sneakers, stereo speakers, computer game, etc.).
Do you take my meaning? Do you see what I'm trying to say?
You must be very young. This break up must seem devastating to you, but brace up. Keep a stiff upper lip and all that. Plenty of fishes in the sea, you know.