Hang around, be nice, and try to actually empathise with her and be a decent guy.

I highly doubt your "bf destroyer" made one iota of difference.

Are you serious? wont that just instantly make her friendszone me?

I dunno if it made a difference, but first i managed to convince her to go on this trip with my mates (ditching a trip with his gf) then when i did my bf destroyer move

Anyways, so far i have just been playing it cool:
-> Met her at an after work event - talked all night ( bar was empty when we left). I didnt make a move cuz she has a bf and works at my place. She adds me to fb next day, no contact.
-> Met her a week later at an after work (she usually never comes to these), again talked all night, everybody ditched us, we went out dancing (no move dont wanna push on a girl thats been with a bf). I convince her to go on the trip. Still no contact. We see eachother from time to time at work, where i will just give her my best smile as she walks by, and she smiles back.
-> Go on trip, have fun drinking, and did the bfd and she started to cry. She cried in my lap for an hour and fell a sleep there. (no contact)

Out of the blue she says high on fb a couple days later i do two cool jokes which made her laugh and drop the convo.

Should i ask how shes doing etc? bring up all that was bothering her last time? (wasnt just her relationship) She wasnt in the best place last time we met, but i dont wanna be friendzoned.