I did vote maybe here. I think it's very possible this was a bit of a soft play on the part of the bf for the reason
@upNdown mentioned above. I know my wife well and I make laydowns in spots I wouldn't against unknown players. Same is true for other players with whom I am more familiar, so it's tough to know if familiarity means collusion. Boyfriend is perfectly entitled to have a 3-bet fold range, so I don't find the action itself indicting.
That is a weird flat of hero's raise though, and a weird play for a novice, and it's convenient the one person that could collude opened the action.
By the same token though, if she is amateurish, you can't discount the possibility that the 2-bet flat was just a misclick and then when she got the chance to raise again she did?
And again, she did show her hand which is unusual, but really, I don't think mucking face down assuages any suspicions either, given the action. Maybe she just learned about the limp reraise trick and wanted to show off? Who knows?
I think there are several explanations including soft-play and non-soft-play possibilities, so I will take the mushy-middle stance here of "definite maybe." With more history and pattern, I might listen to a case of repeated collusion, but if it was just a one-off weird occurrence, I would say misclick or soft-play are equally likely.