有种感情名为自作多情
[yŏu zhŏng găn qíng míng wéi zì zuò duō qíng]
'There's a kind of emotion called self-indulgence' hints at a sentiment where one has misjudged affection reciprocation, thinking more was there than actually existed. It's akin to being unrequited or having misunderstood cues as deeper affection.