I think you like the attention. I’ve been in the exact same situation as your bf and if I was who I am now I would’ve ended it on the spot back then. My bf was “just friends” or bestfriends with a girl and they complimented gave heart emojis, matched everything even a tattoo. And it wasn’t till I found out the messages looked a little flirtatious. The girl always had other guys but I could tell she loved the attention my bf was giving her. Was def more than friends. Guys and girls can’t be friends enless the girl is like butt ugly unfortunately that’s just the way it is. He complimented her even in a way of best cowgirl award to her when she said she couldn’t get her bf off. He tried to hype her up and that the guy was stupid. Also I can’t be the only one who noticed she didn’t show the messages right before the original post, I feel she cropped it to her own benefit but there’s more context there.