Charity is about intention, in my humble opinion.Suffering more in kindness, therefore, is an act of charity with the purest of intentions: no expectations.
Using that as the framework, envy is breaking the emotional health, the pure intention. It comes with baggage: expectations. "Why am I not as 'blessed' as he is?"
Again, if the charity is pure, the intention pure, the expectation is non-existent. Thus, there could be no envy, for, without expectation, there is nothing to "compare and contrast". It all simply is what it is.
Pure, unconditional love will indeed suffer more in kindness. And, that kindness will extend to all, both directly and indirectly. Without external expectations, or internal expectations for that matter, there is no scoreboard, no "what have you done for me lately".
It's simply pure intent.