Hello, SlatkaMala. You do not have to be involved in any manner with anyone. I do think it is a good idea to tell someone who seems interested in being friends or more with you that you are not interested, should the person contact you.

Being concerned about the feelings of others is good in my view, provided there is a proper perspective. Not to be friends with or date someone you are interested in to not want to hurt the feelings of another is more than reasonable people should expect from themselves.