We all make mistakes from time to time. When we do, saying “I’m sorry” is magical because it lets your partner know that you understand and respect them, which helps to bring you both closer together.
Try to be specific about why you’re apologizing, and try to explain how you felt when things went wrong:
I had been very stressed and irritable.
I hadn’t expressed much appreciation toward you.
I had been running on empty.
This will help your partner understand where you’re coming from. It will open you both up to calmly expressing what you need and how you feel.