Honestly everyone can be your real friend and just a friend on fair weather only, I don’t think you can differentiate them before things happened. Namanya suudzon, tau, and that’s not good for your heart. I’m saying, for your heart, not for anybody sake, but your own. So, the only thing we can prevent is for us to not put so much hope in them. I think it’s just fair to treat everyone equally and let the universe do the work. Ever heard ‘birds of feather flocks together’? I believe if you guys are meant to be, you’ll be with the friends in the same vibe just like you. And the Universe will gradually split the one that are not meant for you, such as, a fair-weather friends. So if you value someone as much, your surrounding will be filled with someone just like you, eventually. Not instantly, but eventually.