[SPOILER]
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XY is a crazy bastard. He lived with them just for the heck of it. When he comes back after buying the veggies, XXC asks A-Qing to run away and stabs XY after asking him if he really is XY. XY made SL into a fierce corpse and tells XXC that XXC killed SL and other living people. Out of despair, XXC kills himself. XY waits for XXC to turn into fierce corpse but XXC's soul is in fragment and can't get back together. XY becomes crazier because he can't control XXC. A-Qing sees the entire thing and is scared af. She runs for dear life but after sometime, XY runs into her in some street and takes her eyes out and kills her. Sorry if I spoiled it more that you wanted.
........Spoilers too.......
Maybe XY did live with them for "the heck of it," but I think XY grew fond of XXC's kindness during those last years. I think that is another reason for him to stay. Yeah, we still can't forget he isn't seen as a good person to many, so he has to play and be that role. It really is tragic what happened to all of them...
can someone spoil me on this