Hi Akuma, thanks for replying and showing interest to my questions

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I did send him a letter that confirmed (once again) my decision to stop the relationship for good, and I wished him the best as well. I included this letter although not too emotional, by letting him know how I still feel for him as a person, and that I make a clear distinction between the feelings and respect I have for him, and the fact that we are unhealthy for each other and should stop trying now. I asked him to keep me updated about his life plans if he was willing to.
As an answer, I got a (brutal for me) silence for a week...
Not knowing / being able to respond is ok, but letting me in the dark like this without notice was a bit painful for me, and I believe it was a way for him to get control back after my (very-soft) rejection. After the initial hurt (Ego), I accepted the situation and thought it is maybe for the best. After all I am breaking up so there will come a moment we won't be in touch at all.
That's when he sent me a text, super random, asking how I was doing, that he is sorry he did not respond, that he misses me and would like to call / see each other (which I am not ready to yet, I am still in love for him and trying to move on).
That's when I wrote to you guys on this forum to get some advices (so that was yesterday).
I replied today with a very neutral but still kind message, saying that there is no need anymore to respond to the letter, we should look forward, that I am good and I hope him too. Did not comment on calling / meeting. This message is like 4 lines.
And I got back then a very very very long message. Beautiful message, stating in short that he loves me, that he accepts the breakup and understands now it was necessary but that he misses me, is afraid to loose me (sic!). He also asks again to meet or at least talk.
I don't want to reject him once again because I don't want to create a narcissic injury in him, and also my feelings are still very strong, it is hard for me to do it again and again.
He is such a smart person, very self-reflected and although we never put the "N" word, I know he is aware of his strong traits and he wants to be happier therefore better.
At the same time this is not love, this is him afraid of loosing his currently-highly-valued supply, and as much as I am willing to provide it to him, I need to protect myself and stop sacrificing too.
I also totally don't trust him & his feelings, and I suspect that he is trying to make sure I remain in his harem for later use, or that he is preparing some revenge for daring breaking up. It is a very strange feeling, to be so scared of someone you think you are in love with.
He has never been violent nor aggressive. But he lied, emotionally cheated, and discarded my feelings several times though. I also know for fact that he has other girls waiting on the line and that I don't standup from this "audience" although he says he loves me so much. I never confronted him about that, there is no need, I don't think he would hear and this belongs to him to work on that if he wants to.
I also don't want to create a fight / resentment in between us, because I learnt so much about myself and we have a strong intellectual connection too. I value him a lot even knowing his "dark sides", I just want to protect myself from suffering because of my own issues, it is not good for me to keep loving me.
I don't know what to do. I keep contact I take the risk to loose myself again, I shut the door and I have to deal with my guilt and sadness of hurting/letting go out of my life someone that is truly great.
Thing is I believe that it is not because a relationship does not work in one form (being a couple), that people need to cut off all contacts. This happens mostly in drama breakup which I am trying to avoid.
I wish he would see it by himself instead of searching so much for validation outside... maybe he would love me for real then

But things are what they are.
Really don't know what to tell him now... This is so frustrating