“He’ll get too attached”

So I’m a guy 21yrs old, and over this weekend I was partying with a group of around 10 of my guy friends/teammates as well as around 10-15 girls who we knew. I started talking and flirting with one of these girls for most of the night. After the party is over like 5 of my buddies and 5 of the girls come back to the room we were staying at and it was a chill vibe and whatnot. So the girl I was flirting with starting talking to one of my guy friends, and he was trying to set me up, when she told him “I want to fuck him but I know he’ll get too attached” and no matter how hard my friend tried to say that wouldn’t happen, she wouldn’t budge. Clearly I didn’t score, but I haven’t been looking for a relationship so I’m confused as to how I could’ve gaven off “attachment” vibes. Any help/advice would be appreciated thank you