I ask for so little. Just fear me, love me, do as I say and I will be your slave.

I have a question to pose to everyone reading this.  I was talking to someone at work today and they were talking about "emotional infedelity".  I understood this concept of hers as meaning loving a person without being with them while you are with someone else.  Is this something anyone else has ever heard of?  If this is something real, then I've been guilty of it for years, because there's someone from my past that I will never stop loving.  He's had a place in my heart for ages.  Things didn't really go right for us, but he'll never lose that place, nor do I want him to.  So, does this mean that every relationship I've been in since has been started with immediate infedelity?  Does that mean I'm somehow cheating on the person I'm currently with, because a piece of my heart still belongs to another?  I can't say as I agree with what she was saying, because I've always known it possible for me to love more than one person at a time.  Does this make me different from the "norm"?  Does it make me a bad person to love more than one?  Does it mean that until the other person is completely out of my heart, that I should never try to give a piece to someone else?  I don't understand this person's logic on this point, but if anyone can, I'd really like to see another point of view.  Does anyone agree with me that they don't understand her concept of relationships, that it isn't a bad thing?