2x4 time. You keep worrying about your husband detaching, but HE ALREADY LEFT. He already walked away from his marriage vows. Right now you are the one that is desperately clinging on to someone and something that isn't there. The relationship you had is over and dead. Perhaps in the future you can build a new one, but that will not happen until you let go of the past.
Steve is 100% right, you need to get out of your head and GAL, even if you don't feel like it. Especially if you don't feel like it. Action precedes motivation. Get out of the house, make plans to do something fun when he comes over, or go to they gym. Take your beautiful child out somewhere. It will feel forced at first, but at some point you will forget that it is forced, forget that you are living through this craptacular situation, and you will begin to find your sense of contentment again, find yourself lost in a moment that you are enjoying.
W 34 Me 42 Married 7 years together 8 0 kids 1 beloved dog BD 4/6/2018 I moved out 4/7/2018 I moved back in alone 8/05/2018 I file 3/06/2019 D official 5/7/2019
