<human>: Could you distill the essence of the text into 1-3 sentences?

Today, I lost an old friend. I'm not even phased. It's crazy how if we go through a really rough time in life, which we all have, big things seem not to phase us. It's almost as if it doesn't matter to me, but I can watch a video of a soldier coming back and be upset or brought to tears. It's like your body learned from the past rough experiences and knows when you are going to be severely and just shuts you down, like it keeps you from really feeling it. You still know that you are sad, you just don't really feel it. It is still on your mind, but it doesn't matter. You still go through the day normally. Anyways, just felt like rambling, thank you reddit.
<bot>: Lost an old friend. Not upset. Body shuts down from past experiences of being severely upset, don't really feel it. Not phased.