I rescued an abandoned kitten and his mom came back 1 week later. Should I feel guilty?

I rescued my kitten, Frankie, on Monday after he was left alone outside. He was initially with his litter, but then he was by himself, and days went by with him looking more and more sick. I took him in. The vet said he’s going to be okay, he’s on medication for his diarrhea, eye infection, and ear mites. I’ve been so happy to see him getting better.

Today, out of the blue, Mama Cat returns with several kittens and I just burst out in tears at the thought of having taken him from his family. I do know, however, that he was left behind. I still feel that guilt festering in me, even seeing he is happy with me, warm, and well-fed compared to the other kittens we saw. Many of them not eating or moving, some eating too much. I’m not sure what to do, at this point, the damage is done and I already took him in as my own. I never would’ve intentionally separated him so early on. He was four weeks old, but he was freezing, it was raining, and he was alone with no mom or siblings around.

Does anyone have any comforting words? Opinions? I have been so emotional since seeing the family of cats back in our yard, knowing that I took one of the babies. I keep trying to tell myself that he’s better off and safe, compared to the other kittens, but I wouldn’t want to be taken from my mom and family like that. I also wouldn’t want to be left alone outside one day with my mom never coming back?

Picture 1 is the litter from today and picture 2 is Frankie. He looks a bit greasy because he doesn’t like his medicine and spits it up all over himself. He’s so loving and vocal. I just don’t like thinking I did something bad for him rather than good.