How can I stop loving someone online?

Go meet them face to face.
That usually fixes it.

so nope its just a virus

Stay offline

Well unless you can meet to see if it's real, I'd try and engage with other people more and not stick too close to the individual..spread yourself around...lol

Turn your focus elsewhere

Pick a fight

time is what will eventually wedge it away but it also takes spending your time not thinking about them be busy