Politely reject them, ofc.
“I’m sorry, but I can’t reciprocate your feelings.” I told someone this like 3 weeks ago. I felt so proud of myself bc I felt so bad lmfao reply
wait you love me, ME?! are you serious, are you alright, you don't have an illness right? look at my face LOOK! can this ugly face make you in love with me, we have to go to the nearest hospital now reply
reject them. They're gonna get hurt ofc but it's way less painful than getting led on and believing they have a chance and letting their feelings grow. as to how... id just be honest and polite abt it. its already gonna be hurtful so better not hurt them more by being mean. then you give them some space reply