Not to mention I would like to get at least most of my stuff from his house which he would likely destroy in the case of a phone call break up

I would talk to your family first. Tell them what you have been going through, that this guy is abusive and manipulative and that you're planning on breaking up with him. Plan for the next weekend you go visit him.

When you go to visit him, first call the local police department. Explain to them the situation: you have an abusive and manipulative boyfriend. If he hasn't been violent before, tell them but also say you're concerned for your safety. Ask if an officer can accompany you to this guy's house to get your stuff (preferably when he isn't home, if you can get in without him). Get your shit and leave.

Text him and tell him it's over. You got your shit out of his house. You're tired of not being allowed to have friends or any signs of a life that doesn't revolve around him. Tell him you will not be responding to any calls or texts, this is it. Then block his number. Block him on all social media (but just in case, avoid Facebook for awhile).

If you can, stay with family for the weekend. If you can't, then go back to school and start over. I know you love him and that doesn't just go away. I get it. But you obviously see how unhealthy this relationship is for you. Any time you miss him, read this post. Any time you want to text him, remember your conversation with Taylor.

What your coworker did was a dick move for sure. I certainly wouldn't trust her with any more information. However, it's also possible she did you a favor. If she isn't the manager, I'd inform the manager of your situation (that you've left an abusive relationship), in case this guy shows up at work. I would also tell your manager what your coworker did, so (s) he knows that this woman is in contact with this guy (can she see your schedule and send it to this guy? Your manager should know).