あなたの秘密は守るわ。

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

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

secret; secrecy; confidentiality; privacy; secret; mystery; esoteric teachings

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

to protect; to guard; to defend; to keep (i.e. a promise); to abide (by the rules); to observe; to obey; to follow

indicates emotion or admiration; indicates emphasis; wah!; boo!