I don’t totally blame him for prioritizing himself and this person he’s gained an affection for over this woman who he really doesn’t know anything about and doesn’t even reveal the particulars of her situation till towards the end of the movie.

I suppose that part of what complicates this is the framing device. Namely in that because both Ava & Kyoko are androids, part of the question being asked here, with regards to how Caleb relates to them, is “Does he actually see them as being people?”.

The thing that leads us to question that (at least according to Shaun), is that he doesn’t even seem to contemplate saving Kyoko. It would be one thing if he did so, and still came to the conclusion of only saving Ava, and moreover the screenplay would presumably include a scene where we see him contemplate that directly. The issue (again according to Shaun, I have not seen the movie recently) is that he doesn’t at all.

I agree, but I also think he’s in an emotionally stressful situation engineered by a man much more powerful (physically and socially) than him.

That is somewhat fair tho; and actually something that I don’t think people do bother to consider all to closely when thinking about how Caleb acts.