Rethink your approach.
Don’t try to get him back for keeps. If he does come back, only take him back so you can shatter his heart into a million little pieces when he least expects it. (You can always take him back later…when he’s begged enough.)
Take some time to get over him. Then go nuclear with this:
Do not, I repeat, DO NOT mention your ex, your breakup, etc. to anyone who knows you. Delete any mention of him from all your social media, and if anyone brings him up, change the subject. Items from your relationship should be donated to charity (or put in storage and “forgotten”) unless you’re using them in the spell. It helps you get in the right headspace, and it’ll seem like you’re through with him (people always want what they can’t have).
Remember, revenge is a dish best served cold. Good luck.