So Rude, sometimes, it is!!

When it comes to personal affairs, actions always speak louder than words. If you're not calling this person back, there's a reason. Be honest with yourself. If it's not working out, cut them loose ASAP.
Someone from your past wants reentry into your life. You can extend an invitation if you like -- but delve into your memory first. Is there a reason why you two had a rift in the past? If so, you might want to stay firm.