"You cannot make the grass grow faster by pulling on it" A Sage
Lose the weight, love yourself, as in spank the monkey, buy a vibrator, do not pressure him or spank the monkey/vibrate in his presence, do this alone when he's out of the house, when you reach the point that you can give yourself more/better pleasure solo than you can get from having sex with him, and you are not all that interested in having sex with him any more, he will be magnetically attracted to you again, if his libido has not been impaired by aging, disease, or the extra weight he is carrying. Men need variety. It is hardwired into their system. If you become a new woman, he will find you interesting again, but not if you are a needy woman.
I offer this adviced based on the universal law of attachment, the miracle of letting go, and the rule of sexual attractiveness. The more you love and take care of yourself, the more attractive you become to others. The way desire operates is that you get what you want when you don't want it any more. Let go of your need to change him. Liberate him from the need to be sexually responsive. The freedom will give him ther room he needs to grow. Right now he's stuck in a web of resistance. Remove that which he is resisting and you will find out who he really is. In order to do so, you have to be satisfied. Otherwise he will feel your hunger energetically, even if you don't act on it.
Are the two of you taking Iodine? If not, I would encourage you to consider therapeutic supplementation for detoxification as preventive medicine. If his libido is suffering to aging or disease, this will cause his hormones to kick in and his sex drive will come back strong. Hopefully, your primary motivation in suggesting that the two of you take iodine, will be to remain healthy and live longer, more productive lives, not so that he will have sex with you. Otherwise he will sense this and be reluctant to take Iodine, as it will make him feel obliged to accommodate sexually if he does.
Go to the Iodine support forum, hosted by the VWT Team and read the FAQS. Talk to Trapper and Vulcanel about whether Iodine might revive a man's sex drive....
Is there any sexual or physical abuse in your history? If so, have a look at that. This will tell you why you were attracted to him. People come to each other to be healed.