Me and the girlfriend broke up in sept, so like 4 months ago. We still talked and the past month or so we have been hanging out a lot and having sex again. She told one of my friends the other day that she thinks we are "kind of back together, but not really dating" She broke up with me, and for the past couple months me and this other girl have been flirting and stuff, and she wants to hook up. What i'm wondering is would it be wrong to hook up with this new girl, when it seems like the ex is kind of attached? Not sure if I would ever get back with her, but i can't completely rule out the possibility.