The loss of a baby is hard to bear. I am sorry to hear of his loss.
If you are offering your home as a safe place for him to be for the initial few weeks while he is grieving, that is one thing. Offering your body, your loving arms to comfort him is another thing. Offering you and your husband in a live-in V is yet another thing, and
not appropriate at this time.
You can WAIT to offer that increased level of commitment in your tier of relationship when he returns to stable ground in himself. Don't fuck with fragile. It's not kind.
Changing your relationship level to him when he is NOT mourning maybe two things is better-- mourning the loss of his potential baby, and mourning the loss of relationship with the mother. You do not specify where that is at. I assume they are not together anymore, otherwise he'd be grieving the baby's loss with her.
It's better to be a
friend right now. That's what it seems like he needs most, you with your "friend hat" on.
It is normal to crave sex after a death -- the human need to feel "Yes! Loss happened but *I* am alive!" And since you are "sometime lovers," maybe you both choose to indulge in that and create a space to be that kind of comfort to him too -- the warm body comfort of a lover's arms. So you could schedule a
vacation, not a larger (possibly permanent) life change at a time of duress.
Times of duress are not good times for making Big Life-Changing Choices. If the desire to update your relationship to a live-in V is there now, it will still be there a few months down the road when he is not mourning. A change like that involves your husband too. If you are not taking advantage of John now, you still won't be later either. So wait til later, til you are sure you can take Ronan's word at a time when he is NOT suffering other losses, a better time than the mourning time.
Just as it is not decent to take up with a man who just lost his wife and is a widower, it's not decent to take up with a man who has just lost a partner/baby! He might SAY he is okay, but his circumstances right now could make his judgement clouded.
You guys being in a V could be the right thing, but you could have the right thing at the RIGHT TIME. Wait til his judgement is not clouded from mourning a death.
Also, look out for YOUR best health, not just his.
"We became a V because we saw we really wanted to be together, both in times of bad emotional weather, and in times of good emotional weather."
is a much better reason and foundational start to a live-in V than--
"We became a live-in V because he was upset over his breakup, and the loss of their baby. He thought he wanted this at the time. I was very eager to do it too. But now that the storm has, passed he's flaking out on me. Ugh! "
Your husband's reaction is not "Yay!" but "I think he's just wants what's familiar. But all right." That's worth noting.
If a live-in V is what you want, then give that live-in V the best foundational time you can to start it up in. Don't give it a crap time to start in.
So, be his friend, for sure. Be his lover, maybe. But being his live-in V partner can WAIT.
Just my 2 cents,
Galagirl