As I said before, it takes a while for them to adjust to captivity. It's used to being out in the wild, free to roam around, and now suddenly it's in a glass box! Surely if you were in the same situation you'd be a bit freaked out.
If you kept it, yes of course you would have to feed it forever- not necessarily force-feed, but provide it with adequate food. I wouldn't use wax-worms as a staple diet, they're very high in fat. See if you can get some crickets or Dubia roaches. You'll need to dust the food in a calcium supplement with D3 added, if you're not keeping it under an intense UVB light. Frogs in captivity can develop Metabolic Bone Disease, which is caused by a lack of calcium in their diet. In the wild, the frog would eat bugs that ate plants high in calcium, so it wasn't an issue, but in captivity we need to provide extra calcium with D3- the D3 helps the calcium to be metabolised and absorbed properly.
Frogs aren't really social animals, like humans or dogs or horses. They're normally fine on their own, so I don't think having a frog friend would make him start eating again. Of course if you want to, that's absolutely fine, I just don't think it would make much difference to the frog's state.
I don't think the frog will hibernate, if you're keeping it inside it should be too warm to do so. Hopefully someone who has experience with aestivation will chime in and answer your question. From what I know, you need very precise conditions to allow a frog to aestivate. Without managing these conditions properly, it can be dangerous for the frog.