How to say this word in Japanese?

[Inu Yasha]

-Sorry, it was my mistake　:(
-I won't do it again
-I won't forget, what you did to me

ありがとう　こさいまつ

、犬夜叉

[Christian_]

?

[Inu Yasha]

すみません if I made somebody misunderstand
I'd like to know the word/sentence I wrote 、how to say in 日本語

-Sorry, it was my mistake　
-I won't do it again
-I won't forget, what you did to me

all right now!

[Christian_]

Oh im sorry, lol. Im not sure how to say that phrase but im sure someone here does.

[InsanityRanch]

Inu Yasha wrote:
-Sorry, it was my mistake　:(
-I won't do it again
-I won't forget, what you did to me

ありがとう　こさいまつ

、犬夜叉

This is trickier than you might think, because the circumstances matter a LOT. Who is apologizing to whom? What are the respective statuses of speaker and listener? What is the situation.

Some possibilities:

#1. Watashi no kashitsu deshita. Sumimasen.

A man might use "Boku" instead of "Watashi", but then, if he is speaking to a superior, "Watashi" is quite polite and might be the better choice.

For "I'm sorry", gomen nasai is less polite than sumimasen (even though it looks as if it ought to be more polite.) Mooshi wake arimasen is much more polite.

#2. Sonna koto ha, kesshite kurikaesumai.

Undoubtedly there are other possibilities. In fact, there may well be a "stock phrase", but I couldn't find it in my "stock phrase book"

#3. If anime is any guide, one shouts, "Yurusenaaaaaai!"

Seriously, "I won't forget" is easy: kesshite wasurenai (zo). It's the "what you did to me" part that I can't figure out. What pronoun to use? What verb? (ataeru?) Is this a rareru opportunity? (Oreni ataerareta zai wo kesshite wasurenai zo!...?)

It's hard enough to do melodramatic dialog in English! <g>

Shira

[Inu Yasha]

Thanks a TONNNNN
ありがと　こさいまつ、

[nprz]

What is this こさいまつ about? Do you mean ございます?