First time posting like this and it's gonna be a bit long I think, but bear with me please - I could really use some sensible advice.

So, I knew this girl from uni, but our last contact was like 3 years ago. (for reference, I'm finishing uni now) And, two months ago I started DM-ing a dnd game and friend told me she wants to join. (dnd is a table top game) So we would meet every two weeks, and this girl (we'll call her K) and I started texting. It was going nice, I wasn't thinking anything of it, but we were really having a nice time. We started going for an ice cream or somthing like that and I really liked her energy and we seemed to click. Once she came over to my place to do something for dnd and we had fun, I went over to her place to watch a movie etc. So far everything was fine and we were getting quite touchy and close, but still nothing more.

Then, she asked me if I want to go for a roadtrip with her two friends, a guy and a girl - let's call her J. I didn't know them, but I was down for it. So we kicked it off, it was really cool. At the place we rented there wasn't enough room, so the two girls and I decided to share the bed. And it was fine, I was being a gentleman, but K got really touchy and cuddly and in the end she slept on my chest as if we were a couple... Not that I minded, but it wasn't exactly what friends do.

After that the rest of us went home, K kept traveling for a couple of days. And she was bombarding me with messages, pictures, saying how she is sorry I wasn't there etc. In the meantime I went home and decided to go out with the other girl, J. We went for a dinner and in the end hooked up. I wasn't into her or anything like that, but it was really nice.

So, now K comes back and she knows that J and I are together now and she gets even more close and one night we were supposed to hang out at a friends place (my neighbour) and she was like "I'm sleeping at your place tonight, if you don't have any other plans". So she did and we cuddled, but I didn't go further since I was in a relationship...

Next thing she tells me that it was really nice and wonderful and that we need to talk about a "delicate topic".

Skip a few days, she is going to another weekend trip and I ask her to come to her place and talk. And so I did, we were talking and just hanging around, and when I asked her what she wanted to talk about, she said "oh, about the sexual tension between us..." Sooo, yeah, I gave in and we hooked up finally, me realizing I'm head over heels into her and that the relationship with J is just silly...

So now, K goes to the trip. And I'm kinda ashamed about the thing with J, so I decide that it would be fair to break up with her in order not to hurt her later on. So we did break up, it turns out neither of us felt any chemistry and we were fine with staying friends.

Now, K comes back from the trip and learns that I broke up with J, and first freaks out until I tell her it's not because of her (which is kinda true, but not really...), and I tell her that we will talk in person. And now she just starts putting some distance between us... She basically doesn't text me, a couple of times she saw my messages but took ages to answer... It's just not like her, and I asked her in a voice message if something changed but she said it didn't and that she just has a lot of stuff to do. And I know this to be true, but still it's not like her... Last night she asked me about my day and said that she had her tooth removed and wasn't feeling well, I responded trying to console her and she just saw my answer and didn't say anything for like 15 hrs or whatever...

And yeah, that's about it... The question is, what the hell happened with her? I know I was a bit of a jerk not knowing what I want, but still... How do I talk to her straight, I just wanna know what the hell is going on...

TL:DR I got close to one girl, hooked up with her friend and realized that is a mistake. Hooked up with the first girl, have feelings for her and broke up with the other girl. But the first one is ignoring me now, even though I'm sure she had feelings for me too.

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Thanks for reading and helping. :)