Just that really.
My past (won't go in to it, but on other threads..) has meant my boundaries and esteem were previously completely shot. Much better these days
but...I'm having a 'wobble' today 
Feeling under pressure from Ex re: DC, just some arrangements (I try to encourage a relationship with Ex and DC, he's a good dad).
New P is cheesed off with contact with Ex not being at an absolute minimum. I do have to be in touch with EX relatively regularly because of DC, I try to keep to keep it to a minimum, but things crop up & Ex wants to be hands on and involved in big decisions such as schools etc, fair enough (in general new P absolutely lovely and no red flags about anything else).
Being assertive and listening to my gut are not natural, authentic behaviours for me, is there anything I can do to really cement the boundaries? (had lots of therapy, guess I'm asking for other tips maybe..)
This is what I would like to say to new P:
'I appreciate how you feel about the situation, it can't be easy having to deal with my twunt of an ex however I feel, rather than getting annoyed with me, I'd appreciate and value your support dealing with this complicated situation'
Sound ok?