How can you get your boyfriend of 9 years back after he moves out?
A lot can happen in 9 years and you didn't mention if he had a girlfriend or was married with children. I have a feeling he is at least married, so I'd let it go and move on with your own life. If he is single, was married and is divorced and if you've been in touch then that's a different story and you can try getting together for a few days.
What should you do if your boyfriend of 2 years 9 months wants a break because he said the next step is marriage and he's not ready for that yet?
How do you get over an ex boyfriend of 2 years who cheated had a child and told you about the affair 9 months after when the baby was born?
How do you get back your boyfriend you were with 9 years if he broke up with you out of the blue and now has a new girlfriend?
It sounds like your efforts might be better spent learning how to move on. The end of relationships are terribly difficult, but sometime's there's not a lot you can do. If your ex-boyfriend finds his way back to you, it will be of his own accord and in his own time. If he doesn't, you're free to move on a find another person with which to share your life.
Why do you want a boyfriend at age 9? If you have someone that you like then I would try to ask around to see if he/she likes you back. Find out the facts before you ask him/her out. It saves embarrassment. At age 9 personally I think you shouldn't get a boyfriend until at least 10.If you really like the person then its okay. If you'll know them for a while longer then wait…