>>15-16
You don't have to ask him, but you still have to make it clear.

The best and easiest way to do this would be to mention you boyfriend to him nonchalantly. Just go like "Sorry, I have to log out now. I told my boyfriend I would meet him at xxx" or "A funny thing happened when I was out with my boyfriend today..."

That way, you'll be notifying him that you have a boyfriend, but that your online relationship can still stay the same.