MJ, did your husband try to work on things? Was it an honest effort? Would you have given him another chance if he was working on the problem?
Well, I feel like I gave him multiple chances and he kept letting me down so your situation might be more hopeful. Also, it does seem like you were the "caretaker" in your relationship in some ways so that might work in your favor.
I think it would be helpful to you if you knew what your wife thought was the reason for your low drive. For instance, if she thought you had issues with resentment then she might think that it doesn't matter if you take the testosterone because as soon as you start feeling resentful towards her again you'll just stop taking it. Another way to look at it would be that she's not leaving you because of your LD but because of the character flaw she believes you possess that led you to not take earlier action on a matter so important to her happiness. She figures that character flaw will lead you to make her unhappy in other ways even if you do remediate the sex problem. In my situation, I believe that the character flaw that causes my H to quit jobs is the same flaw that caused him to blame his LD on my lack of attraction so the fact that he just quit another job makes me feel very glad that I'm no longer married to him. In a lot of the situations on the BB the character flaw is probably just "passivity". If that is the case in your sich then the best thing you can do is anything that was pro-active.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver