<human>: My girlfriend will get upset and then doubt whether her feelings are valid or legitimate. It's a very thoughtful process. To give an example she'll be upset with a friend who doesn't reciprocate in terms of level of interest and investment. Then she'll doubt whether she should be feeling that way.

Typically I come in and validate what she's feeling because I feel they're valid. But, when they're negative she just spirals. Of course I try to interject some positivity or optimism, but it's a balancing act between recognizing her feelings are valid but also encouraging her to look on the bright side or to try to work through that negativity. 

Sometimes though I feel like by validating her feelings I'm encouraging her negativity. The thing is I don't find her negativity unrealistic or incorrect. She'll make assessments of a situation or a person and they're quite spot on usually. I'm the happy go lucky guy who typically looks past transgressions.

I know she values being challenged when incorrect, I just don't think she's wrong most of the time and I'm not sure she realizes that. I'm not a yes man, I just find her point of view to be correct about people usually (except in this case haha).

I don't want her to be mad at her friends, but when she comes to me and presents a situation and I side with her (not only because she's my girlfriend, but I genuinely feel she's in the right) it feels like I'm supporting her negativity at times. And I know that while she values my opinion on the face of it, she definitely feels I pull for her on a default basis.

I know it's abstract, I just wonder if anyone has any insight.

Could you distill the essence of the text into 1-3 sentences?
<bot>: How do you validate someone's negativity/feelings of anger without it feeling like you're fueling discontent in their lives?