Courts frown on parents who act unilaterally as it's not considered in the best interests of the child.
The approach you would have been encouraged to adopt before the move is
- Tell him formally you were planning to move
- Attend mediation (not relevant in your case) but maybe shuttle mediation.
3 understand his concerns
- Propose contact arrangements so your child would still have contact.
If this failed ( and it never works with unreasonable men) then go to court to apply for a order to enable you to move. It is called a Specific Issues Order.
You are now at that court stage and a judge at the first hearing is likely to raise the issue of no notice and maybe impose interim contact arrangements. You are likely to be asked to share some of the driving.The fact you have a young child and no home plus non mol, is likely that you will not be ordered back but it is very judge dependant and depends how believable your Ex is.
Just so you know (as it comes as a surprise to most), the courts/judges/cafcass do not care about the impact on you. It is all about what your child needs which a court believes is regular access to both parents.
At the hearing (do you have a date?) a Cafcass report is likely to be ordered and this takes 6-8weeks, it will make recommendations and a judge will read the report before the 2nd hearing and likely to go with their recommendations.
Your Ex will make a strong case for wanting to keep his daughters close together and this will be compelling. Siblings shouldn't be separated, even half siblings.
He will also make a point of your behaviour, acting unilaterally. It will help if you can show that you did raise moving beforehand and therefore he did know. Also if you can show that you have sought to facilitate contact with his daughter post move.
In your favour judges know that people need to move on but your happiness does not trump the impact of your daughter losing a dad and half sister.
What was the contact prior to the move? Has he travelled to see his daughter? How long would it take each way? If he doesn't have family in your area where will he stay to have contact?
I needed to move a short distance to be close to my specialist hospital. Ex went to court and I was surprised how little the resident parent mattered, both parents are seen as equal parents even if you are the main carer. Bf does count as essentially health for a child but that won't be the case forever.
It is important that you are seen as promoting contact even if that means travel and extra work for you.