Blair,Chuck,Nate and cotillon-spoiler

I do not know how long blaie and chuck were with each other in season 1(I don't know if it was considered a hook up or seeing each other or a short relationship because they don't say how long they spent together). I don't think either one was with anyone else. At that point xhuck was absolutely in love with blair, and it seems like she definitely was starting to like him. When nate has his tux fitting for her cotillon, she is more focused on texting chuck(I found it funny she's talked to him before theyre supposed to be long time friends, yet her texts gave no name-not sure if she did that so no one knew). She is 100% in a better mood during this time, and her personality is more on the light, fun side she is enjoying herself. I think she was starting to like chuck, because she even makes comments to him when he acts out ib ways she doesn't like that nate would never do that or him acting like that is why she wouldn't consider being with him(which to me means maybe she has thought about it or just knows how he is so never gave it a thought, nor sure). Anyway, at her cotillon she realizes chuck orchestrates the whole thing with nate and carter:, but doesn't get he did it because he liked her and I think he wanted to be her date. Based on what reason she believed he screwed up her party(for his amusement), she gets mad at said they're done and storms out. When chuck finds blair she's now with nate, and chuck gets hurt and leaves. Blair then sleeps with nate, but in roman holiday she doesnt know chuck gas left for monaco until she sees bart with lily. She then texts him, asking if there's anything she needs to know; but only finds out at the ice rink that he knows about her and nate. I don't think when she initially text him, that she had any idea who knew. So that means her texts about not telling nate must have come from her knowing he found out, but I believe this is only after her initial text(that first wasnt related to asking about nate but maybe wanting to know why he left and didn't say anything). If thats the case, was nate originally meant to be a one time thing because she was mad, or was she planning on going back to nate(because she does say to chuck that their thing is over for good).

Was blaur starting to like chuck, and at think about being in a relationship with hin,, or was just having fun because she thought he could never be relationship material to begin with-thoughts?