Assuming I have guessed correctly as to the 'bad' thing, allow me to say that I have been through this kind of scare, too. First time, I was eighteen and terrified. Second time, I was a little bit okay with it and was twenty. The most recent time was earlier this year. That one scared me really bad, due to its proximity to my armpit.
But, praise God always, they have all been benign. I have a much more attentive surgeon/doctor this time around, too, who is keeping up with follow-ups and such, since they found another one at my last follow-up. I am believing God that they will just go away, that I will be completely healed and never have to deal with this again, and I will believe the same for you.
And, don't listen to the devil. I may not know you, but I do believe that your husband did, in fact, love you. I think what happens is that once love is a choice, more than a feeling, people think they have fallen out of love or never loved in the first place, but no, it's in those moments when you choose to love despite not feeling it.
I think maybe that he didn't do that, but that he did love you, and possibly still does, but just doesn't fully understand what love is. Love is more than feelings...it is so much more than passion...this world lies to us constantly about what love is. I hope that you find peace and comfort in God's perfect love and that, truly, all fears of this pass and that complete and total healing touches every part of your body and heart and soul and that you surprise even your doctors with the disappearance of this thing.