Lovelorn (adjective)

Feeling sadness or despair as a result of unrequited or lost love.

Origin:

From the word love and the word forlorn meaning "desolate, abandoned or left behind", the term lovelorn refers to someone who is sad or despairing because of unrequited or lost love.

Examples:

1. She felt lovelorn after he broke up with her.
2. He was lovelorn after his wife passed away.
3. The lovelorn poet wrote about his unrequited love.
4. She was lovelorn after her boyfriend left for college.
5. He was lovelorn for a long time after his girlfriend moved away.