When you are implementing 180's, they are for you, not your h or to get his reaction. They should be good 108's that will help you. If you are setting boundaries, stick to them, i.e., do not waiver. If you do waiver, he will know that you are an easy mark and will walk all over you each and every time. Another thing, just like tots, if the boundaries are ones that he's not happy with, he will test you time and again and try to wear you down to allow him whatever he wants.
Once you have set your 180's in motion or have made changes that you feel that you need to make for yourself, you will need to stick to them, i.e., they must become permanent. Your mlcing h will sense if they are not true ones that you are committed to, i.e., just trying to win him back.
It's one step at a time. Rome wasn't built in a day, therefore you need to take baby steps in maintaining the changes.
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.