How do you tell if someone actually cares about you? and just say they do?

if they actually show it

See how he/she acts towards you. If they say they do care about you, notice about how they say it. Show how you feel about them. I'm not a true expert, but I hope this helps!

And if they say they do, believe it! :)

think its the third option

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )