love·sick 
/ˈlʌvˌsɪk/ adjective
/ˈlʌvˌsɪk/ adjective [more lovesick; most lovesick] : unhappy because of love : feeling weak, foolish, or unhappy because someone you love does not love you
▪ The movie is a comedy about a lovesick [=lovelorn] teenager.
▪ The movie is a comedy about a lovesick [=lovelorn] teenager.
— love·sick·ness noun [noncount]
