What does sore dewa mean in japanese?

Question:

im curious

Answer:

sore deha is a shortened expression of
それでは、さようなら。(soredeha sayounara)or
それでは、失礼します。(soredeha shitureisimasu)

so, it means
then, good bye or
then, I'm gonna go(or quit) and stop talking to you

in a word, this is used when one want to stop talking/working etc and wanna leave the place.
but if he/she left the place without saying anything, japs really feel offended and start
suspect she/he is angry at me?

so, to avoid such situation, all japs use this term to show
I am going to leave doing this, or talking with you, but please do not offended becuz
I am not angry but showing some respect to you saying this.

very jap way in leaving.
we always thinking bout how we are looked by others. how to avoid trouble.
thats it.