I'm sorry to see this thread descending into such volatility, which given the OP's situation right now is the last thing she needs. Hasn't her husband put her through enough?
@allisonjade - I'm glad to see this hasn't put you off returning to the thread, as despite some unaccepable in-fighting you have received some very valuable advice, and I think some of these people can continue to help and support you.
You asked: If I forgive him after this, does it give him leverage to be worse in the future? Bearing in mind the back story, from my own experience of abusers I believe it would. Other PPs have pointed out that this is a pattern, and the strange thing about abusers (and sadly that's what he is) is that their behaviour varies very little.
One of the most alarming aspects of that pattern is the interplay between love-bombing and abusive behaviour. This is what you've described when he's lost his temper with you before and become immediately contrite afterwards. Each time the abusee is shocked because it's never been that bad before, and they hope it can be explained as a one-off. That's a very well-recognized pattern. Over time, you'll know whether or not this has become more frequent.
A second one is the onset of abuse in pregnancy. That's common too. And the third, and most worrying one judging by your posts, is escalation. Yesterday's events have shown how rapidly that can happen, and how you can go from a position of apparent equilibrium with your spouse (your mutual agreement that you should not go to the funeral) to fearing for your own safety.
That's the unfortunate position you're in now. And I'm sorry to say that this is how it works. Abusers don't have a tendency to get better. But they are known to get worse. This kind of thing escalates - always. You and your DH have suffered momentous losses. I sympathise with you both over that. The reality of his situation, though, is that whilst he's in his current state you can do nothing for him (and please ignore the trite Disneyesque nonsense that this can all go away if you 'just love him enough'. That's crap). You don't have the expertise or current capacity to do anything for him; nor is it your responsibility to help him. All you can positively do amid this nightmare is to continue helping and protecting your unborn child, as you have done up until this point.
You don't know that he will be safe to be around, and his family have warned you they don't think he is. Trust them. For the moment - and I'd say up until the birth at least - you need to make plans to live separately and to foster as calm an environment as is possible. You have four months of this pregnancy left, so this is crucial. I'd also give some thought to whether you'd like to remain in France.
Secondly, I'd make even the smallest hope of reconciliation conditional upon his receiving psychiatric help and care, or at the very least, intensive psychotherapy. This wasn't just any old ordinary meltdown.
It isn't 'love' your DH needs right now. It's help.
Wishing you all the very best 