I’m afraid my iPhone will be hacked

Make sure you aren't using the same password for both accounts.

Read this document if you think your Apple ID has been compromised. --> If you think your Apple ID has been compromised - Apple Support

For iOS 15 or earlier, if you want to see if anyone else has access to your device or accounts, click here --> See who has access to your iPhone or iPad - Apple Support

For iOS 16 or later see how Safety Check on iPhone works to keep you safe. How Safety Check on iPhone works to keep you safe - Apple Support

Related materials:

Personal Safety User Guide

Personal Safety User Guide - Apple Support

> open the Table of Contents and review the articles

A document with general information about security and your Apple ID --> Security and your Apple ID - Apple Support

Contact Apple for help with Apple ID account security by clicking on this link --> Contact Apple for help with Apple ID account security - Apple Support "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."

Janeene68 wrote:

My Facebook was hacked how can I protect the rest of my phone

If you're concerned about getting hacked—this in addition to the above reply—keep your iPhone and other devices updated to the most current available versions.

Your iPhone is not at the most current for an iPhone 7, if you're on iOS 14 as indicated by the footer here.