He is lacking ambition

My boyfriend seems to be lacking in ambition. He doesn't like the course he is studying in college, he doesn't really do anything with his life apart from play video games and wish he was rich. He doesn't study and is on the brink of failing. I don't know what to do? How do I help motivate him? Hes not even motivated about our relationship anymore...

I have brought it up a few times but he has shut the convo down every time.

Now I am losing hope. What should I do?