How would you approach to a 6+ years kid about his father not being in his life?

Kids have so many questions... And i know they just starting there will be more questions to come along but this one I’m asking because it will

breaks my heart once that moment comes.

As mother we want to see our children always happy and playful. Feeling no pain at all at specially when they are so young and little.

In my case my daughter has her dad there for her since the moment I found out I was pregnant.

My daughter she’s the most happiest little person I know despite me and her dad not being together. Me and him have worked things out as adults even though we are not together.

I’m currently pregnant, as of my son he will most probably won’t have his dad. At least not for so long. And that breaks my heart, I can’t stop crying just knowing there’s some stuff I can’t control.

his dad suffers from depression and always sending me how he doesn’t knows when his last day on earth will be.

Always sending me suicidal messages.

I feel like I need to get prepared but most important I have to start thinking how will I tell my son in the future why is his dad isn’t in his life.

I’m always praying for my partner but really there’s so little I can do for him.

Trying to encourage a depressive person is like trying to encourage someone to walk on water.

I’m almost 22 weeks and I feel like I can’t take all this. I’m trying to enjoy my baby kicks so bad, I can’t stop thinking what will happen if tomorrow I get a phone call that my partner have killed himself.