Is suddenly disappearing a bad way to find out if friends actually care about you?

I think this is like "its so sad that I can hear you whisper but you can't hear me screaming" thing. Everyone's different, you can't necessarily change them. Everyone pretends true, but they still try to be there as a friend, a friend who cares. If you disappear nothing will greatly change, those who care will ask where have you been, etc. The only way to find out is to trust them. Trust them, they trust you. Be happy, if not, look towards other things. Really can't think of anything further, hope this helped. Good Luck and always smile~~