I'm not sure if this will help your issue specifically, but I suppose it's worth a try.
Simply put, when any unrelated Sim is near your active Sims, you might see a push notification of the visitor being attracted to your Sim.
Other Sims don't respect your vows, so you may get a lot of calls asking your Sims on a date even if they're married.
This flash dating sim is like no other :) Wow, Frontpage and 100k views? Over the course of ten days, the Bomee lost her right forefinger from making this game, using only a mouse for all the graphics. This is my first game and I hope it won't be the last, so please be gentle!
My current Sim is unable to arrange dates by any means!
The option is not available in the social interactions either, even though the romance level is maxed out. What I ended up doing was repair the game (right click on Sims 4 title in the library and click "repair"), and it works fine for me.