I am truly sorry that you are hurting so much. However, I really do think he’s done you a massive favour. His lax boundaries have already damaged you & although at this point, it doesn’t feel like it, but in time you will see that he’s given you the best gift of all, by not being in your life. You are important, you do matter & you do deserve better. You have a good understanding of what you need to do to make your life better. IMO in time, I’d see another therapist. You will be guarded & of course you won’t trust someone else initially, but if you find a therapist who has good & consistent boundaries, you will be more inclined to trust them & you will be safe.