Sex and love are separate matters. You can love someone without the need for sex or you can have sex without love too. Both are just needs that a human would like to have. Yes, sex is important in a marriage cos physical closeness do equates love to some people but it may not be a necessity for others. Some married people just do not like sex. They will show love in other ways sans the sex part. If your hubby shows you love in other ways, you cannot say he don't love you just because he doesn't like to have sex with you. At the other spectrum, some married men have sex with other women but still love their wives and family.
So you can either talk to your hubby about it again or see a counsellor to help both if you. Alternative find a fb to fulfill your needs. It's not the best solution but if it's just to fulfill a need, why not? Be careful not to fall in love with your fb cos it will complicate matters. Remember that sex, love and commitment are all separate components. The ideal relationship would be to have all three fulfilled with one person. Since you can't, then do it alacarte.
Oh and yes losing some weight might be good. Guys are born visual creatures so dolling up and taking care of your body would be a positive step. All the best TS!