heartbreaker

US /ˈhɑːrtˌbreɪ.kɚ/
UK /ˈhɑːrtˌbreɪ.kɚ/
1.

ハートブレイカー

an attractive person who is likely to make other people fall in love with them and make them feel sad:

:
At the time I met him he was a heartbreaker; he looked like James Dean.