As I know you better than everyone tho I can say that. See ups and downs are part of life .it's ok if today you might fell down WHO KNOWS? , tomorrow might be ten times brighter?.
I hope you understand don't let yourself down in any situation, as per you noticed the world has changed then why do you hope people remain same. I kindly advise you to keep moving on with or without them.
actually, this is life so unfair. sometimes we get lost in dark with a situation but that doesn't mean that we will never find a way out....