Well... I certainly would not "run it past the ex" if I was in a new relationship! Likewise, he doesn't tell me. It's maybe different because I have the kids pretty much all year round (He lives on The Isle of Mull lol) - but sometimes when they go up there for holidays, they mention "Daddy's friend" ... always makes me smile! I really don't mind, and I have to trust his judgement that whoever he has introduced the kids to is not an axe wielding murderer (oh hang on - he married me once ..... hmmmm
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On the rare occasions that I meet someone 'new' I always tell them about the children, but then I talk about them alot anyway as they are my world. I have seen them over the years become attached to someone 'new' and been hurt when it didn't work out - so these days I am way more careful about introducing anyone, and actually, having been on our own for so long, we have an ideal life that fits round the three of us...so I wonder if I will ever let anyone come into that again? - Maybe that is why I remain single? No self pity in there, I have learnt to be happy being on my own...or once bitten.....