It’s not going to seem like it now, but I promise you, there’s going to be a point in the future where you are thanking your lucky stars that this woman came along and that neither she or your ex were capable of keeping their pants on. Because it’s possible that they’ll live happily ever after, but far more likely that, eventually the cracks will start to appear. The age gap will become more apparent and they’ll start remembering how many lies they told when they first started cheating. He’ll stop being on his best behaviour and will start letting his negative qualities creep in. And by that point, you will feel nothing but relief that he’s not your problem anymore and that you’re free from him and his nastiness.
And you wouldn’t be human if you didn’t feel the way you do, but nobody is taking away your position as mum. They might like her, and they might even grow fond of her, but she’s never going to come within a million miles of replacing you in their eyes, and she’ll know this. Kids don’t work the same way as cheating husbands.
You need to remember those two old but true sayings: revenge is a dish best served cold, and the best revenge is living well. You are on the up. It might not feel like it but things are getting better and better and you are getting stronger and stronger every single day. There’s going to be a time when you are feeling your absolute best and everything in your life is positive. And that’s eventually going to coincide with the time that everything in their lives is gradually deteriorating, bit by bit. And you can look at your beautiful children and feel very smug that you’re free of him.
And Butlins. It’s cheap, you can pay it in bits over a year, take food shopping with you and it doesn’t matter how much he spends on fancy locations, it’ll be a week in Butlins with their mum that they’ll have enjoyed the most.