I am reviving this thread to ask (and it may have been asked, I didn't read every single post) what are the consequences if you and ex come to certain agreements and he doesn't follow through? What can you do legally, or otherwise? TIA.
However, depending on what exactly he is not following through on, what the other parts of the agreement say, and the age of the child(ren), and a bunch of other factors that depend on your very specific individual situation, his failing to follow the agreement might maybe just possibly (depending on the situation) give you legal grounds to refuse other parts of the agreement.
For example, if the agreement states every-other-weekend visits and 5 weeks in the summer, if he completely stops all weekend visits, and the child is still very young, this might give you grounds to refuse the 5 weeks in summer. Or it might not.