Saudade

(…) is a deep emotional state of nostalgic or profound melancholic longing for an absent something or someone that one loves. … One English translation of the word is missingness, although it might not convey the feeling of deep emotion attached to the word “saudade”.  …

Saudade was once described as “the love that remains” after someone is gone. Saudade is the recollection of feelings, experiences, places, or events that once brought excitement, pleasure, well-being, which now triggers the senses and makes one live again. It can be described as an emptiness, like someone (…) or something (…) that should be there in a particular moment is missing, and the individual feels this absence. It brings sad and happy feelings altogether, sadness for missing and happiness for having experienced the feeling.