It wasn't because they were heartless, but because they had limited time as detectives.
In American TV series, many detectives would never give up until they got to the bottom of a case.
But the truth was that detectives weren't allowed to do that at all.
Pursuing one case meant that there were other cases that weren't being investigated. Their boss would have their heads if they obsessed over a single case.
Even if they might be interested in a particular case, they could only investigate in their spare time.
That was also the difference between police detectives and private detectives. The former were supposed to maintain order in society, while the latter were hired to investigate specific cases.
Then, Selina asked Luke about his trip to Paris, and looked at the photos of him and Elena.
Selina was quite jealous.
