<human>: Give me the gist of the text in a nutshell

So I met this really fun woman at a house party last weekend, we hit it off immediately, mutual attraction was high, ect. **Fantastic** right? The problem is, she's currently in a LTR. According to her, the BF has told her to break up with him, try dating other people, ect. because he's chosen to just spiral and loss control of his life with substance abuse. He's been emotionally distant, ect. all bad stuff

Blah, blah, blah right? Of course I'm not completely stupid, I know a serious relationship could NEVER come from this, and it's probably just our internal chemistry attracting us to screwed up situations (who would of figured I'd meet another unavailable woman) but...we have been having a lot of fun and I wouldn't be completely against a FWB situation with her...If she was officially single and not in some weird in-between situation. I'm just not comfortable about the whole BF thing. 

We ended up making out at the party ( I feel pretty terrible about it) but we stopped before it continued further. I could tell she was hesitant to actually have sex, though she clearly wanted to as she was provoking me to keep going.

So here's the issue; She wants to hang out again. I want to see her, with the intention of telling her that we should just be friends until if/when she gets her house in order. We are supposed to see each other tomorrow with a few other friends and hang out, but...it looks like everyone else is canceling except for her. I don't want to make a mistake and do something we both might regret but I also would like to keep her (and her social group) as a friend(s). Do I try to walk the line here or just run away as fast as I can?
<bot>: New friend and I have great chemistry and I want to stay friends but I'm worried it'll turn into infidelity.