

I don't know if I can do this anymore
In late March, one of my cats disappeared, Delilah. She's the second picture. She was obsessed with me, was more interested in seeing me than food, and would run up to me every time she heard me outside. The morning she disappeared I slept in. I have her on camera playing with a lizard, then running off never to be seen again. I feel so bad I didn't try taking her to a shelter or that I don't have capacity to foster any more cats right now.
When she showed up last January she was underweight and had mange. I was able to treat her mange and slowly built trust with her, and after her spay in May she started to trust me more. Last fall one of my other females I feed moved over to my house and Delilah and Charlotte started to become bonded and spent most of their days together.
Then there's Charles in the first picture. I haven't seen him in 15 days. He's the first cat I started feeding and the one who got me into TNR. He had a wound that wouldn't heal when he showed up, he taught me how useful drop traps are, and I had to accept loving him from a distance even after almost 2 years. I always wanted to try socializing him after my fosters get adopted but they are taking an unreasonable amount of time to adopt out and I didn't have a room to put him in. I know he might still show back up, he's a smart cat but he doesn't disappear for this long normally.
I feel so guilty that both of them suffered and I wasn't able to do enough for them. I've lost cats before, I've fed cats that I haven't seen in months, but I hadn't built a relationship with them like I have with some of my cats. I have 2 other girls that I can pet and are very friendly and a few males I feed and watch from a distance. How do you deal with constantly losing cats you care about and never knowing what happens to them?
Sorry my thoughts are all over the place and jumbled, I can't think about these two without tearing up and it makes it hard to type and think about.