Am I really asking too much

[ABitOfSupportWouldBeNice]

NC for this
I have 3 children at home, 18, 15 and 7. My eldest 2 are from a previous relationship and youngest with DP.
2 eldest both suffer different forms of mental health. Over the years they've both taken overdoses and self harmed.
Anytime this happens dp goes quiet, almost moody and refuses to talk to me or the dc who's suffering.
Yesterday my dd 15 was taken to hospital after an overdose on antihistamines, I stayed overnight with her. Dp never asked how she was and when I rang him he couldn't have been less bothered.
We were discharged this morning and since then he's hardly spoken a word to me or dd.
Aibu in wanting a bit of support from my partner when I'm going through hell with them at the time, even an "are you ok?" Or "we'll get through it" would suffice.
I've tried talking to him about it before but he shuts me down

I think you need to ask him why he's shutting down.

Does he have experience of someone in his family and suicide?
Does he have experience of suicidal feelings?
Does he think it's attention seeking?
Is he scared of the effect of your shared child?

There's no history of suicide or depression in his family, he's never suffered himself. He doesn't typically 'believe' in mental health I don't think although he's never said that, so yes he could possibly think it's attention seeking

Also yes he could be worried about the effect on our dc but he flat out refuses to discuss it so we never get anywhere