Depending upon who the person is, you may consider expanding things a bit to better explain your reason of return. “H made a surprise announcement of wanting a divorce. We are currently separated.”
It does helps to provide a few details (not all the sordid mess, just a few facts). Folks will want to know, and in the absence of any information, well it’s best to limit the guesswork and gossip. Also, folks do care about you, and they will better empathize with you.
Like I said, it depends. For me, my coworkers were friends. Family friends. Meals at my house. Christmas gatherings with families. They knew my (then) W. Our kids were, and still are, friends. To those folks I explained more fully.
D
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.