Responses

Its not the person rejecting its the person receving the rejection has the right to know, as in why in the world the one fir whom you put up yourself bare and proposed is not doing rejection with out being sincere

IOTR, that was said wonderfully.

Beautifully said. I was asked by someone to give my reasons for turning them down and my answer was just, "No." Pushy people make themselves less likable.
You do NOT need a reason to turn someone down. The other person should respect your decision, instead of continuing to push for a relationship. Kusaba is out of line with the way he harasses Suzumi. "No" is a complete sentence.
Referring to this: http://www.mangago.zone/read-manga/noboseru_karada/mf/282816/Vol1_Ch2/pg-14/