If I change my number, will I still appear as a WhatsApp contact?

I deleted WhatsApp 5 months ago. I'm moving to and another country now. If I change my number, will the people I used to chat to be able to see if I'm online? The one person that I'm trying to have no contact with still has our previous WhatsApp messages. Will he know that I have downloaded the application again and will he be able to contact me on my new number since I'm using the same iPhone?

Yes if they are still in your contacts list it will be synced

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