Thanks, everyone.

I am trying to be strong. Last night after he left he sent a very lengthy text that I interpreted as an attempt to manipulate me to his way of thinking - to believe in him and his words. All I wrote in reply was "your words mean nothing to me now. Good night and goodbye". That stopped him from continuing to text.
Being mean goes against my nature. And here, he has left many things of his - things that belong to him - for me to keep in my apartment for my use. I tried to say no - but he wouldn't take no so I caved because I needed many of these things. I know this is likely a mistake, but it is what it is. So, he has left these things for me, I cannot help but be mean to him and it's very uncomfortable for me because I am not this way with other people and I am not mean in general.
Today also starts limited contact. So, I may have achieved deterring him from continuing the dialogue over text. Hopefully, I did. But yes, I believe I will feel some sort of withdrawal.
I wish I felt better than I actually do right now.