Serious arguments

Question 1

I was nervous too

Answer 1

私も神経質だった。

Watashi mo shinkeishitsu datta

Question 2

I made you feel uneasy

Answer 2

あなたに不安な思いをさせた

Anata ni fuan na omoi o saseta

Question 3

i am nervous too (formal)

Answer 3

私も神経質です。

Watashi mo shinkeishitsu desu.

Question 4

i am nervous too. (casual)

Answer 4

私も神経質だ。

Watashi mo shinkeishitsu da.

Question 5

i regret it (formal and casual)

Answer 5

To say “I regret it” in Japanese, you can say:

後悔している。
Romaji: Kōkai shite iru.

For a more casual form, you could simply say:

後悔してる。
Romaji: Kōkai shiteru.

Question 6

i have a suggestion

Answer 6

提案なのですが

Teian nanodesu ga
ga = soften tone, but not necessary

Question 7

behaviour i don’t (will never) understand

Answer 7

私は絶対に理解できない行動

Watashi wa zettai ni rikaidekinai kōdō

Question 8

It seems that I ended up (meaning unintended, regret) causing a misunderstanding, doesn’t it?

Answer 8

誤解させてしまったようだね

Gokai sasete shimatta yō da ne.

Question 9

i’ll entrust it to you / it’s up to you / i’ll leave that to you

Answer 9

あなたに委ねるよ

Anata ni yudaneru yo

Question 10

I’m very sorry.

Answer 10

申し訳ないです
moushiwake nai desu
FORMAL