<human>: Give me a shortened version of the text

I'll try and keep this short but I might ramble

So one of my roommates and I have been involved in a FWB type relationship for the last 3 months or so.  We both didn't want a serious relationship and we were both comfortable with each other.  As much as we knew it was going to be complicated and we talked about the details we went through with it.  

Everything was great and we even went on a big trip together but it seems that for the last 2 weeks or so (about a few days before Thanksgiving) we have not been on the same wave length.  Before this time we were both openly affectionate and she enjoyed cuddling on the couch with me.  Since then it seems that we've gotten into a couple situations where she was more argumentative and there have been little spats over stupid stuff and she seems guarded, which kills me.  

I'm so used to being affectionate with her that now it's just so awkward that when I try and hug her before I go to bed it's like you can cut the tension with a knife.  I'm on the other end of things.  I'm realizing that even if we stop having a FWB relationship, I ultimately really still love and care about this girl (in a friend/human  capacity or otherwise) and I've been a sad mess for the last couple of days.  Am I being too sensitive that she doesn't seem as interested now?  Should I just wait and see if it blows over?

I mainly just want to know the best way to approach the subject and ask if everything is ok, or if it's even worth it at this point?  I'm sure I've left some gaps but this will have to do for now.
<bot>: Roomie/FWB is suddenly behaving different and it's bumming me out.  Best way to approach the subject/ should I even?