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Bruce put himself in serious danger when he resurrected Clark. As far as he was concerned, it didn’t matter if he was hurt or even killed, as he was ‘less important’ than the rest of the team members.
Determined that Bruce would see how much he’s worth, Clark decides that corrective action is necessary. But correcting the Bat results in their relationship becoming deeper and more intense than either of them could have imagined. And when Barry’s involved in the mix, the relationship between the three of them becomes something much more.
In the same universe, Oliver gives Slade the mirakuru while they’re on the island, triggering a romantic relationship between them that carries forward even after they finally escape the island. And while they are happy together, it’s only when a third member joins that their relationship is truly complete.