自作多情的英文：self-assertion、flatter yourself。

例句

1、別自作多情了，我說的不是你。

Don't flatter yourself,I wasn't talking about you.

2、你真以為他喜歡你？你那是自作多情！

Do you really think he likes you?You flatter yourself!

3、我希望你不要自作多情，在愛情問題上走得太遠。

I hope you are not so far gone in love as you pretended to be.

4、我才不管你的自作多情和想入非非呢。

I have nothing to do with your affections,your delusions.

5、我知道，我的擔心，最終只是被淪為了自作多情。

I know,I was just the worry,eventually fell unfounded worry.

6、我真不知道是更厭惡你們德國人的野蠻獸性還是瞧不起你們的自作多情。

I don't know whether I more loathe the brutality of you Germans or despise your sentimentality.