Loving somebody doesn't mean taking on their burdens or succumbing to their moods. If someone else is experiencing a temporary disconnect from their source or a momentary feeling of fear, powerlessness, or scarcity it does not mean you must join them in those feelings. Caring for another does not mean taking on their energy.
The most loving thing we can do for another is to acknowledge how they may feel, listen to them with an open heart, and look upon them with eyes of non-judgment. Let them know they are heard and understood. Give them a space to process through their current emotional darkness, but don't dim your own bulb and jump in there with them. They need your light! Letting that light go out won't help anyone. Instead use it to see the beauty when they can't, to remember their strength and power when they forget, and to maintain a higher and peaceful vibration. This may take a strong resolve (fear and negativity are easy to absorb and socially acceptable) but it does more for other people than we can imagine.