Guilt. Most useless emotion on the planet. It doesn't help you correct your behavior, and it doesn't help you avoid future bad decisions. It just eats you up.
And most of the time--all (?) of the time--there is nothing (or very little) that I'm actually guilty of doing!
To be guilty of something, you have to have deliberately chosen to hurt someone, when there were other options known to you at the time. Plus, it had to have actually harmed them in some way. In this case, I don't think that happened.
Personally, I think CALS are heroes. We did the best we could, and helped our PALS through the toughest journey.
Now you get to focus on yourself. Make --you-- happy. That's something we forget, after spending so much time being selfless.
Comparing the two of them? Sure. That's natural. Just don't admit it. Never, ever admit it. My wife would mention my previous wife--and previous girlfriends--and I would always reply I don't know what you're talking about I was a virgin before you and you're the greatest! Of course she knew it was a humorous lie, but the humor worked. Women don't need to hear about other women, even if they say they do. They just want to be reassured that you're there for them and always will be.
Depressed because daughter's going to school? Also natural. But, however, comma, conversely...There's more to say about that. Raising a kid these days and successfully getting them through high school and producing an acceptably morally straight, mentally awake and college-bound kid is, these days, a freaking miracle. You have pulled off a miracle, my friend, and you ought to be proud. That she is OK after mom passing is all due to you. A lot of families can't do it. You did.
I hope you've been able to get some vacation time in. You deserve it.