My best friend needs to find a  place to live because her lease is going to expire and  none of her current roommates are going renew or be in the area. She's an awesome person and fellow  LGBT+ and is one of the few people I would trust with my life (in fact,  she has my power of medical attorney and I'm hers so, in a sense, that  is a very literal statement).

When she got the news we spent most of the  night concluding that the best solution  might be for her and I to split a place given my decent  income and housing aid from my University.

But the next day someone who I used to be good friends  with but am now on mixed terms with suggested that they get a place and she had tentatively accepted. This guy has no income and has shown no drive to  improve his situation.  I have tried to help him for over a year by sending him jobs and arranging interviews,  trying to get him back into school, and helping cover his expenses... With no results.

He  is currently living on someone's couch and working a minimum  wage job one day a week plus handouts. And  when he has money he generally spends it on weed, smoking three or more times a day, or on things  like a tattoo that he paid several hundred dollars for instead of paying off dept or for his driver's license to be reinstated  (he is now being sued for that dept and thinks that he does nothing then it will be fine). He  also sleeps constantly including through job interviews...

He  claims that a higher paying job is right around the corner but he's also said that in the past... Right  before he decided that he couldn't handle working more than a day and give up his apartment  in town in favor of a friend's couch (kinda screwing his former roommate). 

He also regularly ignores requests to avoid topics, basically I had a traumatic experience that left me with mental scars and while I am actively in treatment some topics still trigger a panic/anxiety, and at this  point I just don't want to be around him. So having my friend live with  him would mean that I could not visit her.

My friend has issues with depression and keeping a steady work  schedule but has been on a good trajectory recently and I would hate for her to derail that. I'm worried that living with this guy would do that since even if he could pay the rent he doesn't encourage good behavior.

Am I the asshole for trying to dissuade her from  this course of action and am I being selfish? I just want her to  have a stable place to live that will help her. She wants to give him a chance since she knows he wouldn't be able to get a place on his own... But neither could I.

She's my best friend and I would do  anything for her, she saved my life after I fell into depression after my girlfriend and I separated, and I hate to see her throw away a secure future for one  with someone just because she feels like he needs a chance (she's much  more of a bleeding heart than I am).