I'm sending an outbound email message and the code I'm using to select the email address is adding the address to the string array twice. I'm not seeing what this happening - any ideas? Ultimately, I need to be able to pass in either the personEmail to the string OR the Secondary_Email__c but am having this issue with the email address being passed in twice that I have to solve first. 

//some other code logic
//

public pageReference submitEmail(){

     
String[] toAddresses = new String[]{
                    [SELECT id, PersonEmail 
                     FROM Account 
                     WHERE id = :ApexPages.currentPage().getParameters().get('id')].PersonEmail
};

system.debug('email addresses are>>>>'+toAddresses);

emailHelper.sendEmail(toAddresses, acct.id, emailSelected, recipient.id); 


// Email Helper Class

Global class emailHelper {

public static void sendEmail(string[] toAddresses, id acct, String tempName, id recipient) {

    String usersName = userInfo.getFirstName()+' '+userInfo.getLastName();

  	//New instance of a single email message
   Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
 
	// Who you are sending the email to
   mail.setToAddresses(toAddresses);

   // The email template ID used for the email
   mail.setTemplateId([SELECT id, Name, Secondary_Email__c FROM EmailTemplate WHERE Name = :tempName].id);
          
   mail.setWhatId(acct);    
   mail.setBccSender(false);
   mail.setUseSignature(true);
   mail.setReplyTo([SELECT id, Email FROM User WHERE id = :UserInfo.getUserId()].email);
   mail.setSenderDisplayName(usersName);
   mail.setSaveAsActivity(true); 
   mail.setTargetObjectid(recipient); 
 
Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });

    }  
}

Thanks for your help!