As missbelle says, please be very cautious with your online friend - online friendships can be very positive experiences but also very intense, it's easy to get carried away very quickly. He may be genuine, but it's impossible to really truly *know* him - when we communicate online it's very easy to show only a certain side of ourselves.

Your relationship with your boyfriend of 6 years is a real life one, it's not comparable. If you aren't happy with him then only you can decide if you want to leave, but if you are only wanting to leave to be with your online friend then I would advise caution.

Best wishes whatever you decide to do.