Long story short: Halsin's main goal was dealing with the Shadow Curse hence he doesn't allow himself to waste time on something else until the curse is lifted.
About romance issues: His romance was written and implemented only because of fans who liked him very much: one part liked him being adult, serious and witty and wanted to have serious good relationships arc, the others saw him as "hot daddy", and we all know which side "won". Halsin's attitude in Early Access was different, he had different traits, so EA players was shocked with what they got. Plus, his Act 2 story could've been wider and more tragic taking into account datamined information.
But all this info you can find in the " main" Halsin thread.
