Oh, my dear, of course we understand! All of us want to be their number one choice. And, yes, it is hard on the heart to see a bird that you want to love so very much choose somebody else... But, unfortunately, it's parrots nature to be this way. A dog will love whoever loves him but not a parrot. Parrots will love whoever they want to love and, sometimes, there is no apparent reason for their choice but there you have it! It is what it is with them. And, again, unfortunately, there is no way to tell if he will change his allegiance to you. He very well might. Personally, I think that he is not biting your husband so much because he put up with his bites and kept him with him for long periods of time. I think that, maybe, he might have made the comparison in his head that you kept him in his cage for some time while keeping him company by just been in the same room while he got to be out all the time when your husband was home. I am not criticizing you for this decision, mind you. You were getting all kinds of different advices at the time, he was VERY aggressive, you were overwhelmed and afraid of him and, without been able to establish different degrees of expertise, you chose the advice that sounded the best at the time. Not that it was bad advice, per se! But people try to help by giving advice based on what they know and, sometimes, they forget or don't realize that the species they are giving the advice on will not react the same as the species they have experience with... Personally, I think he will stop biting and he will have a better relationship with you. I also think that the fat lady hasn't sung yet on who he is going to end up choosing as his human. Furthermore and at least on my personal experience, I have found GCCs to be more flexible than other species when it comes to been nice to a number of people because the only one that never quite 'went' to anybody else but me was Boca, a male that had been abused and who had found a mate in my house - the other three went to everybody they knew, even my grandchildren (and I don't trust just ANY bird with other people, much less my grandkids!).
Here are Pichu and Boca on me:

And here is Pichu first with Andres and then with Larissa, two of my grandchildren:


You really need to wait until he is feeling more comfortable and non-hormonal because, maybe, during resting season, he will begin to love you (parrots are pragmatic and although they might prefer a specific person, they will love the one they are with, too) but, on the other hand, he might never be 'your' bird. And there is nothing short of divorcing your husband and keeping the bird only with you that will change this because, even if you try to keep the bird and your husband separate, he will know when he is in the house and pine for him. I have a Timneh gray who lives in the birdroom with the other birds. She chose my husband from day one and, in the 8 or 9 years I've had her, she has never switched her preference to me even though she goes days and days and even weeks at a time without seeing my husband. But, every single day he is home (he works in another state and often stays in a hotel there for a few days at a time), she waits hanging from the molding on the door and, as soon as I open it, out she goes like a bat out of hell flying all over the house looking for him. And he doesn't even like parrots! The only reason why he tolerates her perching on him for 5 to 10 minutes is because I make him feel so guilty about it. Now, I have no issues with her. She will not bite me or anything and will come to me when I call her (only she always perches on the top of my head), do piquito piquito and even deign to give me a kiss every once in a blue moon but, if it was up to her, she would be with him all the time!
Getting another parrot could be a solution to your wounded heart but I would wait on such a decision because it's not guaranteed to work and you would have to be very, very careful about selecting the bird. You cannot do a CL adoption, you both would have to go to a rescue and spend time with all the birds there and see which one chooses you and not your husband. Now, if I had to recommend a particular bird, I would have Quigley DNA'd to make sure he is, indeed, a boy and see if I could find a sweet little adult GCC female that likes me because, this way, you are would be making both Quigley and yourself happy. BUT this could also mean he gets protective of the hen...
I tell you, parrots are SOOOOO complex and difficult to keep healthy and happy, it's no wonder almost all of them end up been rehomed...