Show Count per view in Post

The code is not mine, I found it in a Youtube tutorial.
What I want is to display the number of views a post has, but just by clicking and entering into the post.
The function that I have adds a view every time I refresh the page, so why would it add a view if I yet have not clicked on the post?
Can anyone help me to solve this?

This is what I have in my functions file

// Views per post/page
//// Add counts views per post by refreshing(F5) the current post
//Set the Post Custom Field in the WP dashboard as Name/Value pair 
function addview($post_ID) {
 
    //Set the name of the Posts Custom Field.
    $count_key = 'post_views_count'; 
     
    //Returns values of the custom field with the specified key from the specified post.
    $count = get_post_meta($post_ID, $count_key, true);
     
    //If the the Post Custom Field value is empty. 
    if($count == ''){
        // $count = 0; // set the counter to zero.
         
        //Delete all custom fields with the specified key from the specified post. 
        delete_post_meta($post_ID, $count_key);
         
        //Add a custom (meta) field (Name/value)to the specified post.
        add_post_meta($post_ID, $count_key, '0');
        return $count . ' View';
     
    //If the the Post Custom Field value is NOT empty.
    }else{
        $count++; //increment the counter by 1.
        //Update the value of an existing meta key (custom field) for the specified post.
        update_post_meta($post_ID, $count_key, $count);
         
        //If statement, is just to have the singular form 'View' for the value '1'
        if($count == '1'){
        return $count . ' View';
        }
        //In all other cases return (count) Views
        else {
        return $count . ' Views';
        }
    }
}

and this what I have in my index and single files:
<?php if(function_exists('addview')) { echo addview(get_the_ID()); }?>

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