Ok some background- I've known by Gay BFF almost a year- i'm a straight female. He's been with many women in his past and is in an 8 yr relationship with his partner. I am attracted to him (I know-it'll never work out) and he's aware of it. He has not had sex with his partner for at least 3 months (that I know of). I suspect sometimes he might be a lit bit bi (he says he's sleep with Angelina Jolie- and Brad Pitt).

Here's where I'm confused- We've always teased back and forth and such but lately-he's became more flirty (at least if he was straight I'd call it flirty). Others have noticed this too, one even pointed out that he's acting like the little boy on the playground who'd pick on the girl he liked. Most recently he's grazed my breast while pointing out the my dress need taking up. Then in front of his partner while explaining exactly why my bra didn't find me right- he reached into my shirt and grasped my bra straps. I should not that the touching is welcomed-he is aware of that too. After that incident his partner kinda was acting like he didn't want me around. We were going to meet for lunch but his partner didn't seem happy about it- I think they may have had an argument about it- and it got cancelled.

WHat I want to know is does this seem like normal Gay BFF behavior, or does it seem like maybe there's some attraction on his part? I'm more than ok with the concensus being that "I'm reading too much into it." or "Just wishful thinking."
Thanks in Advance.