It's a person's decision to feel bad if they know one of their friends is feeling bad. So like,, Say i'm in a good mood and one of my friends are feeling bad Yes i'm gonna try to help them out or make them feel better, but that doesn't mean I have to feel bad to do it, i can still stay in my good mood, and if i don't, and let myself start feeling like shit, that's my fault, not the other person's. It's their fault, not yours. And I mean, i don't think you purposefully try to ruin other people's mood, so you shouldn't blame yourself for it. Hope this helps, at least a little.
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