invasion of privacy?

how would you feel if you wrote in a journal about your feelings and you wrote things in your Journal that you shouldn't necessarily say to your husband or spouse significant other, you're right how you feel and sometimes when you write down what you feel is not necessarily exactly how you feel but just in the moment of feelings and you write them down so you don't cause problems, but your significant other steals your Journal and constantly reads it then gets upset about the things you wrote about them in the journal knowing why you have the journal... you got the journal so you would start being mean to them and write down the things you would felt instead of saying them to spare their feelings they knew this I thought it was a great idea but now they can stay out of your Journal.... is this considered invasion of privacy should one just get over it or all together just stop writing??