It was not everyday that someone one could spend years or even one's whole life with come up in one's line of sight. Sometimes, maybe said person didn't even exist, fate having planned otherwise. But that had been the feeling Lucas and Christina had shared all those years ago, and they had just found reason not to hold onto it.
So Lucas had not been surprised when he knew Christina had remained single till her accident, leaving him as the only possible cause of her pregnancy. And Estrella, as she must have blamed herself for what happened to the pregnant woman, she must have kept an eye on the latter's father after ascertaining her importance.