My question is do they ever change and stop being controlling or do things just go from bad to worse?
Yikes - get off that merrygoround, it will do you a mischief!
Controlling behaviour isn't a phase or a fad.
It follows a distinct pattern - look up "the cycle of abuse".
Obviously controlling people don't show their hand early on or nobody would date them.
The control tends to ramp up over time, often accompanying significant 'partner events' like cohabitation, getting engaged, married, having DC.
It always escalates - even when there has been a period of respite in the "Idealise" phase.
The abused partner begins to minimise her abuse. Essentially, she is somewhat deadened to it, so sometimes he will need to do 'more' in order to regain his sense of control.
So it might start out with "oh but you look so nice in the blue dress"
move onto
"I thought you'd wear the blue?" & "I told you I prefer you in the blue" to
"why are you wearing the yellow dress it shows too much xyz"
then
"you chose the yellow dress again, obviously you are trying to pick up other men"
Eventually, she just stops wearing the yellow dress. Because it's not worth the aggro.
Now translate that into every facet of her life.
Add in the minimisation - she needs to minimise, deny. excuse, because that's easier for her psychologically that "admitting" that her partner is actively abusing her - & this is how it goes on for years/decades of misery.
Your b/f wanted to control your child-comms with your ex. When you didn't comply, he issued an ultimatum. When you still didn't comply, he decided to punish you with a unilateral declaration of We Are On A Break.
If you are mad enough to ever speak with him again, let alone date him again, he will need to punish you for your non-compliance.
He may even graciously 'allow' you to continue child-comms. But that will leave a hole in his control, which will act like a narcissistic injury on him. So he will either start up on it again, or invent something else that you are DOING WRONG that he can dictate to you about.
Link is down for maintenance but will be up again soon - www.womensaid.org.uk/information-support/what-is-domestic-abuse/coercive-control/
www.amazon.co.uk/Why-Does-He-That-Controlling-ebook/dp/B000Q9J0RO/ref=sr_1_2?adgrpid=1175378834746227&hvadid=73461376512318&hvbmt=be&hvdev=c&hvlocphy=41792&hvnetw=o&hvqmt=e&hvtargid=kwd-73461321216591%3Aloc-188&hydadcr=10572_1820330&keywords=lundy+why+does+he+do+that&qid=1653999080&sr=8-2
oops long link sorry! - but invest in this. Every woman should have a copy.