how to say 自作多情 in English?

自作多情的；陈词滥调的
Mawkishly sentimental;corny.

你真以为他喜欢你？你那是自作多情!
Do you really think he likes you?You flatter yourself!

mawkish

a. 自作多情的,令人作呕的

one-sided romance