Hello MamaKelly
Welcome, you have come to the right place for help and support.
quote MamaKelly:
I'm looking for support as I set boundaries with my 19 year old son w/ BPD, who is too abusive to live at home, yet doesn't do what he needs to do to live on his own (consistent job, roommate issues, spends all his money on marijuana).
First of all I would like to applaud you for recognising the need for setting boundaries, help is at hand, on the right hand side.

under the heading ‘Tools’, click on the link ‘Communicate Boundaries & Limits’.
You say that he is too abusive to live at home yet doesn’t do what he needs to do to live on his own, how frustrating that must be for both you and your husband.
quote:
My husband and I have decided not to financially support him anymore, but I'm scared he'll end up homeless. I think we are doing the right thing but I'm terrified!
You and your husband have shown great courage and wisdom in making the decision that you have. Yes, there is a possibility that your son could end up homeless but then again he might not, either way you are aware of that outcome. I understand how scary and worrying all of this can be, I have been there with my own son and it’s not a good place to be. I am more at ease about it these days, knowing that whatever happens, his life is his life. He is an adult and it is up to him how he lives and what choices he makes.