You do compare because you're the one he chooses to stay with. He's happy with the way you are and is so sure of his assessment of you that he can look at you realistically and present both sides of your appearance. This balance of his views of your body is overshadowed only by a deep fondness and appreciation for you.

Of course you get jealous. You want to be your best for him, right? So when he shows you something he's happy with, you wish you could model that yourself. But the truth is that you are. He's complimented your body. So have others.

You love yourself because he wants you to love yourself and be comfortable the way you are. That's the way to make him the happiest. You love yourself by taking his love for you seriously and committing yourself to it. Then you can start to see yourself in a different light. He loves an amazing person that you don't allow yourself to see. But she's there. Don't you want to see that person he loves? Go look for her! You'll find her!