Sweetbriar, When you go to court tomorrow, dress to the nines and treat him as a business partner who has broken his contract w/you. You now need to look at your situation as a business deal gone sour. Do not engage in any conversations w/him. It is now up to his lawyer and your lawyer to negotiate the arrangements.
Do not demonize him in court or to anyone. Speak only to your lawyer about such things as to what he's doing.
If your h raises a complaint about you driving by ow's house, your lawyer can reply that is it a public road and any and all can drive on it. Now, if she leaves on a private lane, then you may have an issue there.
Learn to step back from this situation. Arguing and trying to justify yourself, as well as pointing out what he's doing wrong is going to get you absolutely no where fast. The more you do this, the madder he is getting and I don't like the way that he's texting your children and saying to them about their mother. It's almost like he's trying to turn them against you.
I think it is a very wise idea to call your carrier and ask how to block his texts and his number from your phone. You need to do this because it's keeping you spun up and yes, you are reacting in a knee jerk manner. Don't forget...he may very well be keeping each and every message to try to use against you....not trying to upset or scare you...but....no more texting!
You can do this, you have to do this for your well being and the well being of your unborn child. Cut the ties w/him and let him go. He needs time away from you and the responsibilities to get through his anger, lust and demonizing of you. The less you fuel his fire, the less justification he has to use against you.
Do not wait to go NC, do it now!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.