I‘be had a past with this girl. Not a full relationship but we went out for 3 months until this July then for various problems it ended but in a good way. In September I’m going back to university and she is in my class, so I’m seeing her every day. The problem is that when i see her we are either at lessons so paying attention to the teacher or outside during the break/end of the day, so we are always with other people around. Considering we had a past how can I get her attention/play with her/let her know I’m flirting when others are there with us in the conversation? (So a group conversation) Is there some body language I can use? Is there some conversation skills I can use?