<human>: So I have this roommate....    
-Nocturnal.    
-Never leaves the apartment except for class.    
-Plays video games, and browses /v/ all night long.     
-I know his brother is severely autistic; I think he is at least ever so slightly so. (Horrible at communicating, bizarre and obsessive interests, slightly delusional, but smart enough to be independent.)    

Roommate has a **fiance**...      
-They met 4 months ago.      
-He fawns over her, is hopelessly in love, would jump off a cliff for her.     
-He's never been in relationship before.     
-His parents have never met her, they don't even know he's in relationship.    
-She goes to college, works 2 jobs, very socially competent, has nothing in common with my low-functioning roommate.     

I have my doubts...    
-She does a lot of drugs (ecstasy weekly, weed/cocaine/acid occasionally) and has gotten roomie involved. He does not have as bad of a reaction as I thought, but I really don't think someone like him should be experimenting at all.     
-She frequently goes out on weekends without him, and quite possibly is cheating on him.     
-She completely calls the shots/wears the pants in relationships. To the point wear I'm embarrassed for him.      
-I'm not sure what she gets out of the relationship, but I get the feeling like she is taking advantage of him somehow. (I have no proof, its just a feeling.)

Give me the gist of the text in a nutshell
<bot>: Socially crippled college roommate, is in his first romantic relationship with girl I suspect plans to take advantage of him. They're engaged after 4 months.