He should have spoken to you.
BUT.
He wants his children to benefit and is worried you might make decisions to spend the money in trust for them, which could benefit you and not them.
Put it like this, if eveything went to you, then you remarried, then you died before your new husband without making full provision for your boys, who inherits it all? Your new husband, that’s who. Bog all to your boys. Even worse, your new husbands (potential) children inherit everything off him when he dies.
So, there is potential for your husband’s assets to pass to a complete future stranger.
Please don’t think my above example is pie in the sky, it happens frequently. There is mention of it on MN - MY STEP MOTHER HAS INHERITED ALL OF MY FATHERS ESTATE AND WE GOT NOTHING.
Fir some strange reason, people do not make wills. It especially prudent with life’s new blended families arrangements.
He could have made sure you had a life provision in the will, to live in the house etc, is that not acceptable? Keeps the money for the boys.