Ah- I think I've got part of the key to this, speaking for myself (I'm sorry if my words are clumsy atm).
I realize when I'm stressed out, or dealing with negatives, I start feeling very despairing about myself, my and the entire present, and the future- or conversely, fear, too, that one more drop of grief will make the dam burst, and I can't bear it- and then everything is internalized more negatively thereafter.
For (a silly) example, but it reminds me of 'supporters'/ relationships, I have to pass a wedding gown store fairly routinely: one day I think, 'what is wrong with me- or there is so much wrong with me'. Another I think, I'm not jealous of spouses, but of the happiness and their opportunity to break from sorrow or loss. Another day, I might think, 'OMG- bondage' (not the good kind lol); another time I think the mannequin staging looks funny- they're all headless like that zombie movie with the brides in the ripped gowns. :laugh: Another day I just decide if I like the styles or not. Most days I don't even notice the store is there.
So really, as the example applies (for me) to anything and everything, when I am frightened I see 'negative' everywhere, when I feel better I just 'see', and I'm happy for others, or don't really even notice, am just thankful for what I have or have had.
Because I rarely at any time, see it as grass is greener about anything, because so many people seem unhappy (?); but I tend to feel more like grass-vs-my-grass-is-on-fire, when I'm really symptomatic, or terrified. And then it's just a fast slide to despair, self-hatred, shame, aloneness,, isolation, giving up, and tossing everything out.
Hope that makes sense! ??