mayorquimby I think you follow his line of thought entirely, they have (I think) an open and honest relationship.
I know they were practicing 'natural' methods of contraception (tempting fate, if you ask me!) and had already had a scare once, so, I think if he really didn't want to have a baby, he should have been more responsible.
So far I have had a very long conversation with him about it all yesterday, and have already done what a lot of you suggested which is to just listen and ask lots of questions, and encouraged him to consider things he wasn't considering, like the effects of the abortion on their relationship, and also the possible positives of becoming a father. However, he is very pessimistic, and is a very black-and-white thinker anyway, so it's really all or nothing with him.
He seems very emotionally cut off from the whole process though, describing how he knew that after the abortion, were it to happen, he'd have to remain physically close to his partner in order to comfort her, even though he knew that he wouldn't be grieving anything himself.
He also said after a recent bleed and early scan, that he was hoping that perhaps there would be a miscarriage, and that would be an easy way out.
I guess I'm just wondering whether, after all his years of seclusion and leading a very self-centred and selfish life (he would agree with this, by the way), that he is finding it very hard to see what is happening from her perspective. He doesn't really 'do' empathy. I feel very sorry for his partner, but I also think that she should know him fairly well by now (they've spent a LOT of time together over their short relationship).
Oh, I'm waffling. Anyway, it's hard to convey all of the intricacies of him, their relationship, and the impact that an abortion would likely have.
I guess my original question stands: am I justified in being direct with him about how I feel, and think things may turn out? (If he asks, of course!)
And as an aside, for those of you who say they need to do all of the thinking and talking, I agree it is their decision, but I think with his lack of experience he really needs to widen his sources of information to really be able to consider what he is doing.