Name calling

Recently, I've felt that my wife has been distant to me. I told her this and we got into a minor argument about it, which I came out of feeling insecure. We were talking today, and I said something to the effect of "we'll never get divorced, right," and she paused and said she hopes not but there are things that might lead to it such as name-calling. She brought up that I recently called her a ****ing complainer during an argument. I absolutely acknowledge that was wrong, and that I should try not to do that, but do you think I'm being held to a standard that I have a chance of meeting? I'd say something like the above happens every few months. We have two little kids and with everything else going on in the world things have been extra stressful. She acknowledges that I've gotten much better at not doing this, but I'm honestly concerned that in the heat of the moment I may occasionally say things like this. Again, I totally acknowledge that these words are not okay, but I'm not sure I'll ever be perfect here. I'm just trying to figure out if this is a reasonable request, or is she searching for a rationale to end the marriage. I love her very much, so I don't want this to happen, but at the same time, I don't want to fight this if it is inevitable. Thanks in advance for your advice.