There will be a noticeable male/female split because women in general are expected to be more empathetic and it's valued in female friendship groups etc, whereas men are not expected to show empathy within friendship groups (and in some ways it would be a faux pas if they did) and not so expected to in personal relationships either. So it ends up as a gender split because women get more practice and do it more automatically (talking in general, obviously individual men/women would vary) but it's a socialised one, not innate.
That said you can learn to read people and also, noticing is not the same thing as giving empathy - if you said "DH I need X from you at the moment" then there could be three reactions - unquestioningly supporting, which would indicate a high level of empathy and trust but just a low level of awareness in the first place of external signs. Less immediate/sceptical/curious but happy to help if/when he sees a reason for it would still show a level of empathy. Giving a token effort but not really trying would probably be that he wasn't particularly bothered. Outright refusal or an angry response would be emotionally abusive.
I would say DH isn't/wasn't in the past very good at reading me and I sometimes have to say "I'm upset, I need a hug" or whatever, although he's got better the longer we've been together and most of the time he notices now, sometimes he picks up on it before I do which is nice. Sometimes I still need to spell out what I need though.
Obviously the apology is a good thing but I suppose if he really has empathy for you then he would feel upset at the thought that you needed him and he wasn't there. So that would be the indicator I think, about whether he cares but is just too tired/shit at noticing, or whether it wasn't really important to him.