... Can my property manager assist me with getting him out of the house? I feel trapped in my own home due to his uncontrollable symptoms and behaviors- my children have reached their breaking point as well.
First of all... this is a terrible situation, especially for your kids, and unfortunately there's probably not an easy solution.
This might not be something it's possible to resolve anytime soon, barring an absolute meltdown by your partner that would land him in jail, or otherwise allow a judge to issue a protective order against him.
Consider breaking this into smaller steps.
As far as getting him out of the house, if both your names are on the lease, that's not likely to happen without a legal reason (like him getting arrested for something). He has a legal right to be there, period. It might take a formal eviction notice being filed against him, which would take time to be resolved in court (and that amount of time would vary depending on where you live).
If you have a decent person for a landlord, perhaps you could explain the situation to them and see if they could let you out of the lease so you could move elsewhere. But if not, that could become problematic.
You need to see an attorney for some legal advice. Can you get a referral for one in your area? You could perhaps pay for an hour consultation to get some advice on your options up front, without having to resort to a full representation (and the $5K+ retainer you'd have to put up for that).
There also might be legal aid organizations in your area that could help you for free or refer you to someone who can help.
You need to come up with a discreet way to document and record his abusive conduct. Voice recorder maybe? Or hit the voice memo function on your phone whenever you're with him? Practice doing this so it becomes easy and habitual. Almost needless to say, emphasis on the word "discreet": when pwBPD realize they're being recorded, it escalates the problem.
Until you can get a resolution, don't make or allow any further changes that further tie you and your children to him. And if he pushes, you need to avoid making a decision; maybe come up with excuses if you can't find it in yourself to openly confront him.