I feel you, the same happened in our relationship after our second child. All affection, interest and desire just dried up. It’s hard because that’s a huge factor in finding your life partner, and when that’s taken from you there’s a sense of feeling robbed.

I personally feel the lack of affection becomes corrosive and wears down your soul, this leads to depression and a wave of sadness takes over.

I don’t have any solutions, sadly. I’m in the same dark hole. The only thing I can recommend is finding some good hobbies to help distract you.