I think you confuse having healthy boundaries with 'you being controlling'
But thats something you can work on in the freedom programme. Please Please do that.
and agree with telling all that you are over, and you dont want to hear anything about him - he will use them to get to you, to try to force a reaction - try to pre-empt this.
Also dont think about asking any messages/info to be passed to him via friends - just try try try not to speak to them about him at all, nothing. Yopu want to create the new habit where he is out of your head and you replace thoughts about him with thoughts about other, more positive thoughts. It is going to be hard, and you will fail at times, but its the result of the conditioning he has done to make him always the centre of your every thought and action. If you start to begin to think about anything to do with him and the relationship - even if its about your role in it, or thingsd you did or said, shout 'NO>STOP' loudly in your head and make a big effort to change thoughts. Have something stupid thatmakes you laugh to think about instead, just to divert your mind from that pathway.
Now also be prepared, and this is why you need to be ready to call the police if he comes knocking.
He will try every technique to find your weak spot - to find the angle that will make you cave and give him a way in. That is why its best if he cannot speak to you at all and you must not listen to him - EVEN AT THE COST OF DEFENDING /EXPLAINING YOURSELF. - that is one of your vunerabilities - explaining and trying to prove you are right/didnt do what he said/ arent what he says. IT DOES NOT MATTER what he thinks or what he says about you any more. You dont need to prove anything to him. It is just a technique to draw you in.
If he comes to your house you must tell him, before he starts, through the door (dont open it) that its over, he must leave or you will call the police. And then leave the front door and get so far away in your home that you cannot hear him - put on the TV/radio to block his voice, and ifg after 5 mins he has not gone, call the police.
Because if he can he will
- promise anything - especially the thing that is your dream
- get angry and threaten
- cry and act pathetic and say yopu are the only one who can save him
- telll you how awful you are and how he is going to tell everyone everything
- say he cant live without you and that he is going to kill himself
- say how much he loves you and what a mistake he made
- etc,etc,etc
none is true. all of it ios to get that metaphoricaal foot in the door, and soon it will be back to the same.