I’m sorry for the long post, but this situation is complicated. My husband recently cheated on me, and we’re trying to work things out. At the same time, another couple we’re close to just broke up because the girlfriend cheated—though that’s unrelated to my marriage.

One evening, I was on the phone with my husband when he asked me to send him a picture. I was distracted and didn’t double-check the contact I clicked. I had been messaging our mutual friend about a 3D printing project, and I accidentally sent him a private photo meant for my husband.
The friend immediately messaged me, saying I had sent the wrong thing. I panicked, told my husband something had happened, hung up, and called the friend crying. I begged him not to look at it and to delete it. He reassured me he hadn’t looked and deleted it right away. I apologized again and ended the call.
I then called my husband back, explained what happened, and apologized. He said it was fine, and we moved on. Afterwards, I called the female friend—his ex—to explain everything. I wanted to be clear that it was an accident, that I’d never betray her, and that I valued her friendship. She thanked me, and we ended the call.
This morning, after my husband left for work, he got a call from that same female friend. From what I was told, she suggested I had done it on purpose. Now my husband is upset, saying I “got even” with him.
Everyone seems to think I did this intentionally, and I understand why it looks bad. But it truly was an accident. I’ve apologized, explained, even offered to cut contact, but nothing is being heard. They’ve decided I’m a cheat.
I feel embarrassed, guilty, and devastated. I just want to fix my mistake and rebuild trust.
Edit for clarity: the ex is also my friend. I told her because I felt guilty and didn’t want anything hidden or twisted.