I do not think he is unfeeling. I would just call him "Not Dealing" many people can function at work but not when it comes to family, and let everyone else do the functioning, they just hand over a check, if they have a good job.
I do get that he is not operating with the head on his shoulders....
I also get that he is interwoven in a clan that is not good for all concerned.
Other wise he would not be calling the conception a one night stand, he is definitely evasive, and IMO if we open up the closet, skeletons would fall out. He hangs with questionable circles. JMHO - But I'd bet on it.