Way to let the situation not weight you down. I'm glad you're staying upbeat. I had to play "fake it till you make it" for a long time before I finally detached.
Key word there is DETACH. You do things for you. If she wants to join you, that's up to her.
Yes, the plate things was petty, but please try to limit your apologies to her because it puts you back in a negative light.
Women operate almost entirely on emotion, and so when you apologize, you are actually putting a stamp on a behavior you see as negative, but you have validated her reaction now by essentially telling her that she was right to be upset with you.
Read up on validating. One of the big things you'll get out of it is that we don't validate by apologizing or saying "I'm sorry," we do it by relaying an understanding to the emotions that they are having.
phrases such as "that seems really frustrating," or "I get why you would feel like that" take the focus off of your actions and put them on WW's emotions.
If she's gone for a few day, you have some time to do some reading. The sooner you start to understand Detaching and Validation, the faster your interactions with her will become positive. Also do some reading about toxic relationships as it might help you to get detached a bit sooner.
Honestly, though, even though I mentioned your interactions with WW first, your focus NEEDS to be on you and becoming the man you want to be.
What are your goals and what are you doing to reach them?
If it's getting in better shape physically and mentally, I'd suggest lifting and reading as much as time will allow.
Focus on you because she may or may not come back. Your goal should be to become the best possible version of yourself so that you know that you're living your best life whether she's in it or not.