How to... (Friends edition)

I started talking to this guy (we’ll call him Paul), he actually started talking to me, & after a short amount of time, I found out that he’s close friends with someone I use to hookup with (we’ll call him Zack). Zack & I don’t hook up anymore & haven’t had sex since November. However, I still have feelings for the guy & catch my self drunk texting him from time to time.

**Paul knows about the situation between me & Zack because I told him in the beginning that I didn’t want it to be weird if he found out before I could say anything, especially if I knew before he did.**

I don’t wanna keep leading Paul on. How do I tell him that I don’t wanna pursue anything further because I still have feelings for Zack?