So much advice needed here

I’m a stupid one just to start off 😂 I started hooking up with this guy from a dating app. I approached him and said are you trying to just hook up and he said yeah well that’s all I was going for too bc usually you get ghosted after that. Welll he did not ghost me. We’ve been hooking up for like 3 weeks and I mean like every chance we get. The sex is absolutely amazing we mesh so well when it comes to that. Like seriously best I’ve ever had. Here comes the stupid part 🙄 I am starting to get feelings for him. I don’t have much experience with guys actually coming back like Iv always been ghosted or it was said right away that it wasn’t going to work out. We haven’t really talked about a relationship and he never really said he didn’t want one he just said that first ever day he just wanted to hook up. I teased him a little and sent him a sexy picture nothing crazy I was at a concert and he said “well don’t you look nice” and I didn’t answer to tease him a little which was advice from a friend. But it worked he texted me like 2 more times and I said I’m free Tuesday and Wednesday and he said “okay we can do Tuesday but what’s your schedule Monday?” So what makes a guy keep coming back? Is it just the sex? Could he possibly be catching feelings too? I might need to stop it soon bc I am just hurting myself right now. Iv never had a guy show so much interest before but how do you know if it’s just the sex? 😩 I do have to add he seems really sweet and caring and I know he’s not hooking up with anyone else Because we’ve talked about it and I mean the straight fact of how much we are he wouldn’t have time 😅