君はまんまとだまされてきたのだよ。

you; buddy; pal; monarch; ruler; sovereign; (one's) master

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

successfully; fairly; artfully; nicely; thoroughly

to trick; to cheat; to deceive; to coax; to wheedle; to soothe and humor (humour)

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

be; is; indicates past or completed action; indicates light imperative

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!