>>116139138That's bullshit, because if they were such good friends he had to protect his daughter; he would have stopped her from being Batgirl, or at least told him about his daughter.
Now let's re examine your problem: Robin abandons his Girlfriend and Best friend, on explicitly bad terms. They already work together, and now they bond over their shared grief. Two very attractive adults who lives are constantly in danger, who wear the same uniform and only have each other to confide in. She's the perfect woman for him. The only person who actually has the same goals in life as him. Catwoman is an unreliable tease, Talia is happy being pimped by her father, every other girl can never know about Batman.
You don't get to leave and expect everyone to put their life on pause. It doesn't ever work.