Assuming you were not coerced in any way, send him a message saying that you think it's probably best that you both forget it ever happened. You might also mention that you don't expect any favours...

Leave him alone. Even if you do manage to seduce him, he will hate you for ruining his marriage.

Wait a while until after you've graduated. Then, if you are still interested, meet up and see where it goes. You may find that once he's not your teacher anymore, you won't feel so strongly. Additi...

Imaginary friends are normal for children, but not for adults. But I agree with Anime7 -- if you know he's not real and he's not causing you problems in life (eg you have no real friends), then you...

Live your life in the way that makes you happy, but bear in mind that there may be aspects of friendship that are difficult to cultivate online. In particular, many friendships are nurtured by shar...