It can feel flattering when friends are interested in you, but it can also make things awkward. The important thing is to be honest about your feelings so nobody gets mixed signals.
If you’re not interested in dating them, kindly but clearly say so. A true friend should respect your answer, even if they feel disappointed. Being honest is kinder than leading someone on.
If you’re already in a relationship, make sure your friendships continue to respect healthy boundaries. Trust and honesty help keep both your friendships and your relationship strong.