Deeply affected by some strong feeling, as (a) sorrow, (b) longing, (c) envy, (d) repugnance or loathing, producing effects similar or comparable…

Overwhelmed by (esp. unrequited or unfulfilled) love; languishing for or with love. Also figurative and in extended use.

(a) Pining with love or grief. (b) (With reference to looks or behaviour) expressive of love, desire, or (esp. affected) emotion.

love-sick.

Unhappy as a result of unrequited love or the loss of a lover; pining from love.