Most Helpful Girl
If you don't want to indicate you miss him or want to get back together, keep the conversation very minimum, don't stare or make much eye contact and don't talk about the past. If you bump into him, just nod your head at him and ask how he's doing tonight. I say "Tonight" so you can avoid asking him how he's "BEEN" since the breakup. So, if you focus on the idea of it being tonight, he should say something like he's okay or doing great, etc. Then just respond "good" and move on.