My wife and I were talking about Stella the other day. Stella isn't her real name of course, but she is a real person. We come across her socially every now and then but don't know her well and don't even know her surname. A very casual and somewhat infrequent acquaintance.
Stella is gregarious and very chatty so everyone ends up chatting with her at some time or another. She even chats with us occasionally and we are not particularly gregarious - at least I'm not. But Stella is easily garrulous enough for two.
Yet she is pleasant, never spiteful about others and as harmless a body as one could wish to meet. Maybe rather dull if one is inclined to be a little unkind, which people hardly ever are with Stella.
The trouble is, there is a fly in Stella's ointment.
She only talks about herself and her personal situations. Usually at some length and in considerable detail. She might ask you where you live, but only as an intro for telling you where she lives and how she came to live there and what it's like living there and... and...
She might ask you about your holiday plans but only as an intro for telling you all about her own holidays in minute detail, including tales about people you've never met and never will meet. Yet she speaks of them as if you knew all about them and their holiday experiences and... and....
Yet we say Stella is a nice person and so she is, but the line she treads so well and with such delicacy is surely a fine one.