@Dramallama82 I completely get that he has his own issues with his mum losing her temper, and that this can probably be triggered in what would be normal healthy arguments between other couples, but at the same time it is not fair for him to use that to decide whether or not you two can talk about an issue.
If you are starting the conversations calmly, and not in the context of just after an argument and he will still not engage there is nothing more you can do.
Honestly op, even if he does decide he still wants a child with you, I would question is that really what you want? I get that you want a baby but do you really see it with him if you feel like he doesn't even care when you are crying in front of him? What sort of father would he realistically be? What if you disagree on a decision to do with DC?
The saving grace that you have at the moment is that you do not already have a child, there is nothing tying you to this man which means that you still have the opportunity to start over and find the right partner that will give you what you need out of a relationship.
I think you are doing the right thing by not running after him and standing your ground on this occasion, maybe it will force him to have an actual conversation! In this case it is clear that the issue with the sex is just a symptom of the deeper problems, which makes me feel like a right idiot as my first comment was completely off the mark 
I really feel for you op.