Salam. Once I was talking to my friend about my husband and she called him Ali bhai (brother), so I misspoke the same word. Then I read somewhere that mistakenly calling your husband your brother doesn't void your marriage, rather its by comparing them together. Now I get these whispering from Satan (Bad thoughts) regarding how my husband looks similar to my brother and his back is like my brother etc. I haven't said it to his face but I just keep thinking these bad thoughts.
Whenever I realize that I am having these thoughts, I say 'AstagfirULLAH' (May ALLAH azawajal forgive me). I read somewhere calling your yourself a disbeliever also nullifies your marriage, now I get whispering about these thoughts as well. I don't speak any of such whispering but I keep thinking about them that I may be a disbeliever but then I say the 'Shahada' again and then I think that since I became a disbeliever, my marriage must have nullified. I love my husband a lot, hence I am very conscious of all these things.
Please let me know if my marriage has nullified or not?