彼は熱さにがまんできなかった。

he; him; his; boyfriend

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

hot (thing); passionate (feelings, etc.); ardent; hot (e.g. gaze); hot (e.g. temper); zealous; enthusiastic; fired up; intense; severe; extreme; hot (topic); of interest

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

patience; endurance; perseverance; tolerance; self-control; self-denial

to be able (in a position) to do; to be up to the task; to be ready; to be completed; to be made; to be built; to be good at; to be permitted (to do); to become intimate; to take up (with somebody); to grow; to be raised; to become pregnant