How to make him get the message...

So this is about a couple I know who have been married for 25 years with problems and the wife had decided to seperate since their daughter has grown up enough to understand and she's already in college so she has support of her friends if she ever feels hesitant to talk to either of them (her parents)

Anyway; so the husband is really clingy and is insisting of this relationship to go on rather than letting it go and moving on...

But now he's trying to attend eventss with her friends and her side of the family and she wants him to stop trying to interfere

Any advice to help her? It would be awesome to find a way to atleast turn him down without being too harsh to hurt or too easy to return to the habit