You may call him a liar, but you cannot call him a bad man.
Kare o usotsuki toiu koto wa dekiyou ga, akunin to wa ienai.
he; him; his; boyfriend
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.
liar (sometimes said with not much seriousness); fibber
called; named; as many as; as much as; all X; every X
thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
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
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
bad person; villain; scoundrel; wrongdoer; wicked person
if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)
to be possible to say; to be able to say