What factors may cause unhappiness between 2 young people in love?

Unhappiness between young people in love can stem from a variety of factors, including communication issues, differing expectations about the relationship, and external pressures such as family opinions or societal expectations. Misunderstandings and jealousy can also create tension, while lack of emotional support or personal insecurities may further exacerbate feelings of discontent. Additionally, changes in priorities or life goals can lead to a disconnect, making it challenging to maintain a harmonious relationship.