彼はあの子にほれこんでいる。

he; him; his; boyfriend

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

that (someone or something distant from both speaker and listener, or situation unfamiliar to both speaker and listener)

child; young (animal); young woman; young geisha; offshoot; interest; new shares; player who is not a dealer (in cards, mahjong, etc.); bird egg; -er (often of young women)

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to be charmed by