Long term relationship going stale

I’ve been in a long term relationship for 10 years and have two beautiful little boys with this person (4 year old and 10 month old). I care for my partner deeply. My family is my entire world. But lately I feel a shift in me. My partner and I rarely have sex or physical interaction. When we have engaged in intimacy, it’s only because I’ve initiated it. I feel undesirable and lack self confidence. We live in a remote town and neither of us really have any friends so we live in each others pockets- for years we’ve been this way. I am becoming bored with the repetitive conversations and routine. The lack of appreciation and affection is making me fantasise about other people- even though I am very much in love with my partner and would never want to break up our little family. I’m just miserable. I’ve tried talking to him about all this stuff a few times and it never ends well. So feeling a little bit out of sorts and conflicted within myself and my future. He is talking to a therapist (non sexual related) to help him cope with day to day stresses (mostly about anxieties around our kids and home life). I understand that he is tired. I am too. But he’ll chose solitary confinement in his own space (doing his own thing) instead of coming to bed with me- being affectionate…

I feel incredibly lonely and sad.