Quick answer: A cat that follows you everywhere is showing attachment and using you as a source of security and social connection — it's normal bonding behavior for many cats, especially single-pet households.
Cats are more social than their independent reputation suggests, particularly with their primary attachment person. Following you is an expression of social bonding — your cat considers you part of its group and prefers your company. Breeds like Ragdolls, Siamese, and Burmese are especially prone to this.
Cats follow the person who controls food, access to rooms, and play sessions. If following intensifies near mealtimes or when you sit down, your cat is tracking resources rather than purely seeking company. Both motivations often overlap.
Following becomes a concern if it's accompanied by distress — vocalization, panting, or destructive behavior when you leave or move to another room. True separation anxiety needs structured behavioral intervention and sometimes veterinary support, especially in cats raised without feline company.
Following behavior is usually affectionate and normal. Monitor for signs of distress when alone — that's the threshold where it needs attention beyond accepting the companionship.