If I got "gaming con" right, I know what OP is talking about and, while I'd be suspicious and jealous, it's not necessarily a red flag. As a gamer myself, the "gaming universe" is pretty diverse and people are really, really into it, they're mostly not "casual online gamers". I can see a situation where it's all about gaming because you've found someone who can be a nice addition to your team for example, no flirting involved. But I think it's good that OP set up some boundaries, I would have done the same.