I hope he lives for as long as possible with as good a quality of life as is possible.

So much gets put on parents for mental health concerns but the model that's supposed to be used is biopsychosocial so there's the physical biological part, the personal individual psychological part and the social which isn't just the parents: It's the whole society and all its problems and responsibilities that affects individuals. Try not to allow yourself to feel too much guilt though I know as a loving parent that's really hard.

It's difficult when someone you love gets such a diagnosis, you grieve the time that's cut short. My partner has stage 4 melanoma and it's been up and down between us. It's a shame we don't get to fix everything before we have to deal with such trauma but all we can do is our best. Keep loving him and even if he doesn't quite realise it he'll know deep down you've been there for him x