The past continuous describes actions or events in a time before now, which began in the past and is still going on at the time of speaking. In other words, it expresses an unfinished or incomplete action in the past.
For example, I was watching a TV series.
"A" has quarreled with "B" and they don't talk to each other. "C" wants them to compromise with each other. "C" runs into "B" and says,
I was talking to A this morning, and I think he feels really bad about it.
The "talking" apparently has finished, yet why the past continuous tense is used here?