What should I message him ?

I started talking to my ex recently as friends, for context the relationship was very healthy and was very non toxic, however with me going to college we broke it off. We started messaging again in November and I realize that I still have feelings for him that came back. I want to write a message to him saying how I don’t think we should talk until I’m over the things I’m feeling towards him but I don’t know how to word it without it being weird. I want to give an explanation of why I don’t want to talk to him because I feel like he deserves it. Any help?