it is a sad thing tho, making connections but losing it.
mc was 'lucky' to be alone... kinda? since he didn't seem his parents die and lover and children, because by the time he got the eternal life he didn't have any of those. he was alone and being suppressed by the world expectations of talent.
he going into seclusion was his choice, but also forced, since he would go hide somewhere anyway since he didn't seem to have many connections or place he cared about.
but now after so long, going around again. those will die, this place will crumble. his help is nice, but will this place be forever prospering? believing that is naive. they will die and so will this place. at least eventually, maybe it will take hundreds or a thousand years, it is only a question of time, and he has much of it. as humans changes, and their places too. maybe their decedents will go somewhere, or they will simple die off. the world will still be filled with life, but not the life he protected. whole empires crumble, why wouldn't a little city? if he really become too caught on his feelings, he will never leave, because leaving is letting them free. if he can't understand the scope of how much help he can give, and how limited his action are, and that he can't save everyone, he will suffer. maybe this old man saw that, he is helping them, but how much will he be able to help? does he understand his own limitations, and will he come to regret it once he understands?