So I'll try to make this as brief as possible. Recently got back in touch with a girl I haven't seen in about 5 or 6 years. We were childhood friends first and then there was a spark of interest down the road between us at one point that never went anywhere. The reason we got back in touch is because coincidentally friends of mine just moved into the same apartment building as this girl and her boyfriend (yes she has a boyfriend lol) and I messaged her just to say hi and mentioned that we should catch up some time. I'm also dating someone at the moment but it's currently on the decline. Anyway, one thing led to another and she invited me to come by the apartment because her and her boyfriend were having some friends over. I went over and rocked the whole night. Made myself the center of the room. Included everyone in the conversation etc.. Even had the boyfriend laughing. My target was sitting next to me on the couch and I was getting a few IOIs (laughing at everything I said, touching unnecessarily). The next day she texted me a few times (small talk stuff) and then ended up asking me to come out to the club later for her boyfriends birthday. At this point in the interaction I've been playing it very cool..Teasing her, negs occasionally, and distanced to a certain point. So I met up with them later on. This time the IOIs could not have been more obvious. Started with a direct flirtatious comment about how good I looked and then it went from there. She led me to the bar by the hand to get a drink, sat next to me the entire night with 100% focus on me. I worked the group, talked to everyone and even took the boyfriend to the bar to do a birthday shot. He didn't seem to notice at the time what was going on with his girlfriend and I. I think Mostly because he was socializing with all his friends and distracted. Then she started making all these comments about how she was always into me back in the day and how she's not happy with him and "imagine if me and you dated" type stuff. At this point I was flirting back but not too strong. We all walked out together and she texted me afterwards basically saying "she was screwed" referencing the feelings she was obviously catching. That was the only direct reference she made about it. She texted me when they got home to say that they got into a blow up fight about it and the boyfriend flipped out. She said she defended me which made it worse. No more was really said about it. I said my small stuff back to that and then she dropped it so I did too. We talked through text briefly the next day and the last thing that she said I never responded to because it was the type of text that didn't need it (something like "lmao") . This is where it gets tricky..so I never responded to that last text and I didn't reach out to her or anything after that but then 2 days later I get this big long text about how she made some mistakes that night at the club and how she could have ruined things with the love of her life and started blaming it on drinking (which she only had a drink and a half). Also saying that things would be tough for a little because of things that were said that night (which I didn't know if that meant things would be tough for me and her or her and her boyfriend) but anyway, I hit her with the perfect response. Basically saying that I completely understood. Everyone goes through ups and downs, nothing worth having comes easy blah blah. Then I even negged her slightly at the end and said that obviously some signals were misinterpreted which was too bad because it was a fun night before it turned into a reality tv show (something along those lines). She never answered that one. That was a week ago and I haven't heard anything from her. What's my next move? Is there one? I'm pretty much the worst for wanting what I can't have and I don't want to walk away when I've invested some work into this target. Remember the keys.. She lives in the same apartment building as my best friend, she's made it known that she's not happy with her boyfriend, but it's going to be so difficult to see her if the boyfriend has an issue with me now. Advice??