Why am I getting his friend as suggestions I don't follow him?

The guy I worked with had my phone number. I never gave Instagram permission to sync my contacts. I know he probably did thats why i got him as a friend suggestion. I thought you only get your followers, followers as friends suggestions when you follow them. Have anyone experienced this. It's really annoying especially when you don't want to be reminded of a person let alone his friends.

Why am I getting his friend as suggestions I don't follow him?
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