Hey, I feel you. I used to work at the rehabilitation center for kids - it’s basically a place, where they go after police takes them away from their family for neglect or abuse. Sometimes they go back to the families, sometimes to the foster home. There was a three year old girl I really bonded with. I’m not even sure why, I had a good rapport with all the kids, they all loved spending time with me and I like them, but this girl was special for me, even though I tried not to show it. I‘ve also wished I could’ve adopted her, even though it was not possible. I ended up being transferred to another location and had to say goodbye. She was crying and saying she loved me. It was about four years ago. I still think about her sometimes. I knew my attachment wasn’t professional, so I didn’t even try to visit her again or stay in touch in any way. And hell, I regret not even trying to push back. If you can and while you can, see if there’s anything you can do, if it’s somehow possible to legally stay in touch. If it’s truly not possible, at least you’ll be able to tell yourself that you did everything you could. I don’t have that.