Dating does not make you someone's girlfriend or boyfriend. It just means you're dating - going on dates. So when…
What are you talking about? They were definitely together. He just didn't want to publicly acknowledge the fact that he had a girlfriend so other women from his field and I mean pilots could hit on him. He didn't respect her, he just thought of her as something temporary before he found a 'better' match.
It honestly saddens me that the vast majority of the comments are focused on discussing whether this drama is a BL or not. That was exactly my concern before the drama started, and unfortunately, it seems to have become true. This is why I find parts of the "bromance" community so frustrating. Whenever a bromance drama begins airing, so much of the discussion immediately becomes focused on whether the leads are romantically or sexually involved, rather than the actual aspects of the drama. What about the music, the characters, the cinematography, the story, or everything else that makes a drama enjoyable? It's completely fine to ship the characters or interpret their relationship whoever you see fit, but I wish the conversation didn't revolve almost entirely around whether the leads are gay or not. There is so much more to discuss about a drama than that.