He wanted to remain friends but I said no. He initiated the break up.
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If it's just been a few days, I'd give it more time.
I would find it very weird if I broke up with some dude, and then HE wished ME good luck in the future. Also if you didn't want to stay friends, you might be mindfucking him by forcing contact.
If you want to stay friends, you should tell him that, but I'd try not to text him for at least a month. Maybe that will be good for both of you?