yeah i was bothered by that too! but it seemed to me like miyuki already knew that honoka has no chance and she also knew that honoka is a bit obssessed and won't give up easily so she didn't see the use of telling her off . i bet she was thinking "well if she wants to try then let her and i will enjoy the outcome of her stupidity" . and besides i love tatsuya and everything but dude sometimes he seems like he is leading her on. if you don't feel anything for her just say it straight out that you will never love her without confusing the girl with the whole "i had an accident and blah blah so i can never love" which resulted in honoka thinking that tatsuya was just lying to her. and there is no need to take valentine chocolate from her. if i was him i would have refused her.

i don't mean to be rude to japanese people but often their attitude in not wanting to her other's feelings and not standing up for their point of view is the cause of situations like this where if he were firm and said what he thought then most misunderstanding and forced situations won't happen. imagine what the events would be like if miyuki and tatsuya were really uncaring about what the others wanted and only think about what benefit them.