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To cut a long story short, after good conversation with HBroommate of about 2,5 hours we got to dancing/kissing. (while she actually was 6 years older then me, lol!) I didn't take her home though, because I missed the hints. In hindsight, I think that's for the best.
Now, I'm afraid that this spontanious event between me and HBroommate has ruined ALL my chances with HBcoworker now!
Not ruined at all. You just boosted your social proof by showing HBcoworker that her own friends find you attractive, and by not giving her too much attention. You are inadvertently doing exactly what you are supposed to do, albeit in a very slow and dragged out way. Now the part you're missing is where you finally turn around and show HBcoworker some attention, with confidence, and escalate to kino, kissing etc.