彼はがっくりひざをついた。

he; him; his; boyfriend

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

heartbroken; crestfallen; dejected; disappointed

knee; lap; knee and thigh (while sitting)

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

(usu. written as kana when referring to a solid) to pour (into a vessel); to fill; to dish out food or drink