My boyfriend let his beautiful colleague take a sip from his drink at a work function?

I stopped by a work gathering of bfs colleagues after hours and there was some girl visiting from another office who is new. They were talking a lot and he then offered her a sip from his drink! Then I said I needed to go do some work and he said he’d see me later and stayed there talking to her even after everyone else was leaving. He came home at like 10pm and said she needed help with something. I also heard her make a comment about visiting her and he said “yea for sure” and I asked him about it. He said “her office!! Not her house!!” I dunno. I think he’s attracted to her. I also saw them do a weird pinky swear thing. He said she told him something and he promised not to share. I asked what it was and he said he promised her… he said they’ve only met and spoken at work. And per the title she’s fucking stunning (looks nothing like me by the way features etc.
My boyfriend let his beautiful colleague take a sip from his drink at a work function?
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