I use the words "I'm sorry" to mean two different things. One being "I apologize for wronging you" and the other, "I empathize with your situation".
90+% I'm using it as the latter, however, my spouse (and other people) often respond along the lines of "It's not your fault".
What is a good alternative to way to convey "I empathize" to my spouse to show her I care for her troubles without always sounding like I'm apologizing?
This question is very similar to this and somewhat this, however, the answers to those are more targeted at responding to strangers, acquaintances, friends, etc. They are not as relevant for someone I spend a significant amount of time with, and say this to as often as a dozen times a day.