Although there is a certain amount hints pointing to that, there is no real evidence they're dating
...It's more like the opposite? When asked about their relationship they say things like "Oh yeah, we see each other naked all the time". You can argue that we shouldn't entirely believe anything a vtuber says about their personal life, but Flare is one of the more genuine Holomems, and the way she abruptly started referring to Noel as her lover was fairly striking