Talking to teens about dad poor choices

[Meow13]

Hi

I'm in the middle of divorce and have a 15 and 18 year old. Usual tale of mid life crisis and affair with younger work colleague. I have spent the last year being lied to and led on by him. He has also lied to the kids frequently and is only parenting when it fits in with him such as spending xmas with his girlfriend and her child and making no attempt to see his own children!
I would like to talk to them about choices and lies but don't know how to do it without making it sound like I'm just being mean about their dad but equally don't want them to think that his behaviour is acceptable!

Any advice appreciated!

It tends to be better to say nothing and let children draw their own conclusions. Otherwise it can look like sour grapes. My brother had an ex who refused to work after divorce - this was about 15 years ago now - and was forced to pay spousal maintenance. The kids worked out for themselves that their mother was a lazy so and so, he didn't have to say anything (although he chose not to defend her choices either). When they reached their late teens they even asked their mother to stop buying them birthday and Christmas presents because they knew it was their father's money paying for it all.