I feel you don't seem to have come to terms with the fact that there is no good and bad side to him. Only the bad, and the mask. All that good stuff you remember, was just an act to draw you in. None of it was real. Its like falling in love with a tv character, thinking that the actor playing that character is really that person. They aren't.
The coldness...the emptiness where something (affection, kindness, warmth, basic human decency) should be - that is the real him. And if you saw him for that, for the cold klamy leach, desperate to such the life out of you to fill the bottomless emptiness in himself - you'd want to get as far away as possible.
Also, he hates you. HATES. Remember that.
So either you don't know this...in which case, I hope you do now and can start coming to terms with it. OR you were just feeling a bit lonely and needed reminding of what he is amd that the good stuff was all lies and manipulations.
You made a mistake getting back in touch, you know that. Now you need to do damage control. Block and delete him on everything. You are stronger than you think.