Of course DH loves you! He is doing everything you have asked of him because he loves you. But you don't love you!!
I wonder if the thing with G was more about the way he made you feel as a person than about the man himself. For a while you liked yourself, loved yourself even!
You don't need DH to make you feel sexy and attractive. You can do that yourself. Lose the weight if you need to, wear nice underwear, exercise, eat well, look after yourself. Stop looking to DH or G to make you feel better about yourself. To make you feel happy. Your happiness is your responsibility. Your DH responsibility is to share it, enjoy it with you, not provide it.
Yes, i know, i'm being a cow and you hate me for it BUT..... I just want you to realise that you are a worthwhile person in your own right. All this with G is sapping everything from you. I want you to focus on you, not him!
If you could change one thing about yourself, something that would make you happy, what would that be?
I'm not talking material things, i'm talking about you yourself, October.
(I'm not a cow really by the way )