dnt know how I should be

So at 130am my hubby gets a call from one of his younger sisters saying that his other little sister is the one girl that they are looking for in Hawaii waters...this is his baby sister she was about to be 21 in a couple of days...I am just as hurt we been together seems like forever but my probably is my hubby doesn't really know how to take this which most ppl won't but my problem is myself how do I be supportive of him I never really had to be this way or did I get this as a child to understand...do I give him to space do I baby him but I dnt want to see him go down the drain