My guess is that, on this site, you get a notification when somebody likes you, regardless of whether you have liked them. While for some guys this can be nice, for most-desirable guys I can see them getting spammed with hundreds of “likes” from women they would NEVER want to date, and this guy was getting tired of it.
The most desirable guys on these sites get less attention than an average woman there. Online dating is totally skewed in favor of females.
Which is why I think dating sites cater to women, because if there's no women, there's no revenue stream.
Thus, sites have an incentive to let guys know when a woman expresses interest, but NOT bother women with uninvited expressions of interest (if you want to piss a woman off, just express interest in her, while being seen by her as undesirable).