Does a relationship change when going from online to real lifeWatch
They are just pen friends with modern technology.
You don't know enough about the other person via online only communication to be able to tell if you should become their sexual partner and boyfriend / girlfriend / husband / wife or not.
You can only find that out via real life time together.
Most of the time, people in real life are worse than how they came over online. Sometimes they're better. Sometimes equally good but different. But most of the time worse.