How do you tell if a Sagittarius is sad?

Yahoo question:
I just read an answer mentioning how it's hard to tell, and when I think about it, it's true. My Sagittarius friend is always happy and bubbly. She hasn't seemed herself for the last few days even though there is nothing specific I can put my finger on because she has still seemed pretty bubbly. So how do you know if they're sad?

Yahoo answer:
i am myself a sagittarius so i can answer your question from personal experience. i can't say i am a very happy person, i mean i have so many problems and my life is not one of the best, but i don't want everyone to know that. so that is why i am trying to show to everyone that i am a happy person, so that they remember me like that. and around people i feel different, i can forget about all my problems and just smile
When i am really sad, i am very quite , i don't speak to anyone , and my eyes are really sad. if you see a sagittarius crying in public, i don't mean real crying, having tears, watery eyes, it means the problem is so big that they can't hold their emotions even when they are around people. something bad might happen to me and if there are people around i can say everything will be ok, everything is for the best, live goes on, and i can come home and start crying.. we don't show our emotions because we are affraid to get hurt, many people use our trust and that is why sometimes we can't trust people

Mine summarising and concluding:
- We do had many problems in our life but just that we do not want everyone to know that.
- We want everyone to remember and see me as a happy person.
- Around people, we often can forget about all our problems and just smile and joke around with them.
- When sad, if a sagittarius cry in public, it means that the problem was so big that we could not hold our emotions anymore.
- When sad, if a sagittarius don't cry in public, it means that we are telling people that everything will be ok, life still goes on, and we can go home and cry.
- We don't want show our emotions because we are afraid of getting hurt, many people use our trust and that is why sometimes we can't trust people.

My comment:
This is so true about sagittarius. Yesterday something very upsetting happened to me. Something that was very insulting and hurting and abusing. But still after that, I went to tutor my student and after that went to meet WN for shopping. During the process for being insult, hurt and abuse, I did cried but after that I collected my feeling and clear my mind, I stopped crying but instead I feel super emo and blank. At that time, I wanted to be alone at the beach listening to the waves, enjoying the breeze and observing the beautiful sunset. I don't wish to move or think about anything else. I am quite surprised that I am able to carry out the tuition and outing with WN without losing my temper, showing my mood and affecting my time with them. I am quite proud of myself about it. Last time, if I am upsetted, I would show my mood and temper and worse that I would vent my anger on other people. But now I don't, probably because I had grown up? and become more mature in my thinking?. Another point that was true was that when we are around people, somehow our sadness disappeared and forgotten and life went back to normal as if nothing had happened before. But when I was left alone, even for a few minutes, my mind started refreshing with those bad memories and once again, I was feeling emo and sad in my eyes. But the moment when our friend came back to us, we were behaving normal once again. I guess we can controll our feeling and mood really well. Another thing I am proud about myself. But somehow went I am left alone, I feel really really very emo and my tears almost dropped in the bus when the memories kept flashing back. I almost couldn't control myself and how much I wish daddy was there for me to cry on. How much I wish, I could hug daddy and had a big cry. How much I wish, daddy could protect me. So far, I have never ever had a big cry in front of public or in front of friends. Seems like my biggest problem had not come yet.

WARNING: I PURPOSELY HIDDEN THIS POST HOPING NO ONE WOULD SEE IT. IF YOU HAPPEN TO SEE IT, PLEASE DO NOT ASK ME ABOUT IT, BRING US THIS TOPIC AND MAKE ME RECALL THOSE UPSETTING MEMORIES. I WROTE IT TO RECORD MY DOWN MOMENT, NOT FOR YOU TO DISCUSS ON! GIVE ME TIME AND PIECE AND I WOULD RECOVER IN NO TIME AND EVERYTHING WILL BE BACK TO NORMAL. IF YOU EVER MENTION, BE PREPARED TO EXPECT SILENCE FROM ME. RAWRRRR!!!!