Does it mean I have to shoot them? Asking for a friend.

I'm in that top categorie, but I must admit that I regret my vows.
Life is an awfully long time and people change.
It's hard work and even if it's successful, no one can stay in love for a lifetime.
It's just not possible.
In the end, it's about becoming each other's best friend.

These need altering. Because if my relationship is unhealthy I'm leaving.
Especially if I've done all I can to fix it.

I don't believe in divorce and I'll make that clear to the person I marry. I'm marrying them because I love them and I'll always work on our love together there's no exit routs.

Scariest line in the vows

It means until death do us part. If a person doesn't understand that meaning then perhaps they shouldn't be considering marriage in the first place.

once someone dies it's over.

What it says.

It means, if I die, my best friend is going to kill you. You will not move on and start a new life without me.