Wow, there have been some extreme views expressed here. Also, I'm surprised about the number of posters that keep on asking questions that the OP has already answered earlier in the thread or making assumptions about things that the OP has already cleared up.
To be frank, I think that there are a couple of posts that really sum up the situation very well.
One of them is the very first reply you received from CogitoErgoSometimes Although it was stated in a rather light hearted manner, I do think that it does get to the heart of the matter. You need to be more scary than she is - or at the very least a bit more assertive than you're currently being.
The second is the post by Dahlen Wed 08-Jan-14 16:27:27. It's rather long so I won't quote it again here. I also think that wannaBe has given some absolutely excellent advice and support as well in a number of different posts.
My own small contribution to the situation is this; many posters have said that it is your bf that is deciding not to take things any further and that this is because he isn't so invested in his relationship with you. I believe that this is wrong.
Apologies to other posters if I have mistaken the points you were making, please feel free to correct me.
I think that, perhaps, this stems from the stereotype that all men are ''confident and dominant'' or, read another way, ''abusive and controlling''.
However, there are many men that don't fit that stereotype - particularly when it comes to relationships - and, especially if they have spent a long time with a partner who has a more dominant personality then it can be very hard indeed to stand up to their partner even after leaving them.
There are countless threads here where women have posted about their controlling and abusive partners and how it is still very hard to stand up to them even after they have left them. Do the posters here really believe that men cannot find themselves in the same situation? If so, I would suggest that those are incredibly sexist attitudes that they are displaying.
OK, so what to do about it?
Well, I would suggest that the longer this situation goes on the harder it will be to resolve. If it goes on for a long time she will be more used to getting her own way and will react more strongly when your DP stands up to her.
I think it might be a very long time indeed before your bf will be able to stand up to his ex. As a result, going for a court order may be the best way to go.
In the short term his ex may well go nuclear and carry out her threats of denying access. You should prepare yourself, him and get him to prepare his dc for this.
In the longer term this will provide a more secure basis for him to be able to stand up to his controlling ex. However, in the short term I'm sure that it may well be a whole world of pain for everybody concerned.
At the end of the day, if you want this relationship to succeed then I think that you really have to support and encourage your bf to stand up to and confront his controlling ex.