I hooked up with my ex-date now my best mate. I’m now a bit confused and don’t k

I (F,29) and a guy (M,28) met almost a year ago through some friends. We first hit it off and started dating for about 2 months. Things then didn’t work out so we stopped. Because we’re in the same friends group, so we still see each other and hang out.
I don’t know why but somehow we get closer and closer and be actually such great mates. We text everyday and tell each other pretty much everything. I can say he’s one of my best mates atm. We talk about other girls and other guys and such. We are emotionally close and physically close as we don’t have any problems with hugging, kissing cheeks and such thing.

Last night, we went out and got kinda drunk. It was first from some quick playful kisses from him,then it got more steamy then we made out. At first, we kinda stopped cos it felt a bit wrong, he was like: “oh, it feels kinda wrong.” But then we kept doing it. We were actually feeling it, and decided to leave the bar together. We went back to his place and hooked up.
It was actually really fun, we had a good time and the sex was even better than when we were dating.
Then we fell asleep, didn’t cuddle but sleep on two sides of the bed.

I may look into it too much, but when we were dating, he didn’t take it serious at all and I was seen as one of those girls he was seeing. We didn’t cuddle when we were dating at all. He used wake up the next day, being grumpy, didn’t talk much and were very annoyed with everything (cos of hangover). He used to take me out for some quick bite in the morning or I went home by myself as he seemed not to enjoy having company while being hangover.

So in the morning, I was kinda nervous when I woke up next to him but then he was half awake, he tucked me in, held my tightly and we started cuddling, he kissed my cheeks, my forehead, my nose and such, And we gave each other some awkward morning kisses and kept cuddling while sleeping.

After 2-3 hours later, he got up, took a shower and told me to get up cos he was hungry and wanted food. While I was getting ready, we kept chatting nonsense like how we usually do. Nothing weird but it’s just us in general. He laughed a lot and didn’t seem to be annoyed at all. Then he took me out for brunch and we spent a few hours chilling together outside, ofc still talking a lot about other boys and girls. Everything was completely normal. He was chilling comfortably around me, patiently waiting for me and we had some good laugh. He dropped me off at home after that.

I was feeling ok about it at the time. Until some of our mates who saw us together saying that it was pretty weird that we did it cos we are too close. I think I might be looking into it too much, but now I felt a bit strange thinking about how close and lovey dovey we were on the night before and in the morning.
I don’t know how drunk he was but he said he wasn’t that drunk while we were having sex.

He doesn’t do fwb cos he didn’t believe that it was a thing. We fell out in the past because we didn’t want anything serious and we still kinda not looking for at rn.

To be honest, since we are now very close. I enjoy spending time with him and talking to him, I might be worried this hook up thing might ignite some feelings in me. I don’t think he feels anything more than friendship with me even we’re very close and he always says thing like I’m his favourite person.

Sorry, I’m just really confused and having a bit of a mess so I don’t really know how I should feel.