He is way behind on his rent.
Kare wa yachin o daibu tameteiru.
he; him; his; boyfriend
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
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.
considerably; greatly; a lot
to straighten; to correct; to cure; to falsify