I think the guy dislikes me. We haven't met each other for more than a half year after his rejection. A few days ago I registered for an event in a group. Later I saw that he also registered for it but in another group, and he quit the group where I clicked "going". I can't tell the exact time when he did these two things, but quitting a group makes me think he knew I would go. If he knew that and avoided me like that, why would he still register for the event? I don't know how to act if I do run into him, especially in front of many strangers.