exP and lack of verbal boundaries

[caketherapy]

I don't know if this is a question, more of a rant.
We've been apart (after many years together) for a couple of years, I instigated the split after years of him ignoring/taking me for granted.
He went to online dating the week we split. Not that relevant but he's let me know he's had a lot of sexual partners and now has a girlfriend. I wish him well. As we've been cordial with each other, I confided to him ages ago that I went on a few single pointless dates last summer.
He decided to tell our ds recently about his girlfriend. I've known for a few months but never mentioned it to ds, as it's not my news to tell. Apparently ds immediately asked about me, he blurted out I'd been on a few dates. So ds (age 12) comes to me today saying - 'I hear you've dated a few duffers mum'
I felt pretty mad. I then explained myself to ds. Texted ex-P, who said that it's a learning process(!) I was 100% clear in texts to never discuss my dating history again.
Obv I should never have mentioned any dating history to ex. I'm learning. I won't going forward. This feels like the final nail in coffin of our 'friendship'. He's broken boundaries like this before over last 2 years. I think because he wanted me back oddly. He's still mad I gave up tolerating his behaviour.
I feel angry he thought it ok to mention my pretty mild dating to ds. Whilst leaving out his colourful history.
Do exes ever respect boundaries?
I'll get over it, but I find it sad.

This man isn’t your friend, stop treating him like he is. He’s an Ex for a reason.

I can understand you trying to maintain a cordial relationship with him because of your son but in this case, the price appears to be him behaving like a twat, only you can decide if it’s worth it.

Time to turn a separation into divorce.

Hi Op
You need to work on your own boundaries first.
"Do exes ever respect boundaries"
You set the boundaries for yourself, not him.

One thing I have learned in my 52 years is that people talk. If you don’t want something repeated then don’t say it to anyone. I don’t particularly think this is anything to do with exes and boundaries as if anything, it is you that relaxed the boundaries here. I don’t think it is particularly bad that your 12 year old knows you went on a couple of dates, so let it go, but don’t confide in your ex again.

So ds (age 12) comes to me today saying - 'I hear you've dated a few duffers mum'

Yes son, your dad was the main one.

I don't tell my ex anything personal because he is incapable of discretion. News is currency to him, he will blurt things out to our ds with no thought for how that news might affect him. It's as if he wants to show off, that he is 'in the know'. Horribly selfish.

So there has been a total news blackout for 10 years.

Your ex is an ex for a reason.