Oh @Ktre, What a wonderful strong woman you are to come on and ask your questions. I know you feel very fragile right now but believe me, you are so much stronger than you think.
What your husband sees when he looks at you is so much more than a missing breast. You are the woman he loves fighting to be healthy. Your scar doesn't say illness and defeat, your scar says 'I'm still here and by fuck, I'm fighting as hard as I can. There is beauty in that, it can bring you closer together but it does take work and open discussion between the both of you. Breaking the initial 'ice' can be hard.
I used dark humour, now I have never named my girls before, but I said to my husband, "Well now you've only got Pinky to play with. Perky's gone" It made us laugh and cry and opened up the conversation. If you can, be open and honest with your hubby about how you're feeling.
Have a look at the links, especially the LIz O'Riordan one and look into counselling too if you want. Accept all help that is available to you, but remember, advice, including mine, is just advice, do what feels right for you.
You are in a good place here on the BCNA network with loads of love and support, reach out any time you need.
Hugs to you xxx