to  have   somebody or something  on the brain
have
hæv
hāv
somebody or something
ɒn
on
on
ðə
dhē
the
breɪn
brein
brain
[have] {sb/sth} on {one's} brain

英語での「 have somebody or something on the brain」の定義と意味

to have somebody or something on the brain
01

to be unable to stop talking or thinking about someone or something 

慣用句
くだけた
Ever since the breakup, he has had his ex-girlfriend on the brain, constantly reminiscing about their time together. 
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