Katriona O’Sullivan: ‘I don’t start conversations online with strange men... I have seen too many relationships end because one partner gets close to someone else’

I don’t talk to strange men online, and I don’t think my husband should talk to strange women online either. I know this might make me sound rude, or terribly jealous, and slightly insecure, but the truth is, I think that it is opening doors and windows that should stay tightly shut when you are happily in a relationship.