YOU SAID:

I asked him out last week, but I haven't seen him again since.

INTO JAPANESE

私は先週彼を誘ったが、その後二度と彼に会っていない。

BACK INTO ENGLISH

I invited him last week, but I haven't seen him since.

INTO JAPANESE

先週彼を招待したが、その後会っていない。

BACK INTO ENGLISH

I invited him last week, but I haven't seen him since.