Bernd will probably refuse to accept the truth, but...
Girls like this are usually femcels. Often from a strict traditional upbringing, which caused them trauma, which is why they failed to get a boyfriend.
Lacking (usually inadvertently shutting down) attention from boys irl, they turn online, where they discover thirsty simps. And from there it's just a sharp downhill.
And yes, most of them will quit it when they find a guy irl. Even if he doesn't know about it. (They won't, however, if he's a simp who "supports" it.)