英语上一般有三种：
1、flatter yourself
eg：Do you really think he likes you? You flatter yourself!
你真以为他喜欢你? 你那是自作多情!
2、proffer a love or affection which is not reciprocated /ri'sipr�0�5keit/ (报答)
3、imagine oneself the favorite of one of the opposite sex
第一种简洁实用~
flatter yourself
imagine oneself the favorite of one of the opposite sex
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