If you have low-self esteem issues and are trying to hide your insecurities by crushing hard on someone, then it's definitely unhealthy. You will lose your sense of individuality and will also try to validate your existence based on that person.

How do I know if my obsession is unhealthy?

There are other signs of this disorder, such as: repeated texts, emails, and phone calls to the person they're interested in. a constant need for reassurance. difficulty having friendships or maintaining contact with family members because of the obsession over one person.

Is it unhealthy to have an obsession?

It's not uncommon to think of being obsessive from a negative perspective, especially if you've had unpleasant experiences. Being obsessive is unhealthy if it causes you mental, emotional and physical problems, and if it also affects other people.