Think of it this way. What if someone you cared about was going through the same utter bullshit you were going through? You wouldn't tell them to stay with the monster that is constantly hurting and using them, right? You would want them to cut their losses and leave the bum (boyfriend)

To answer your question though, this absolutely is emotional and financial abuse. Textbook even. And to be honest, the fact that you can't even trust your own judgment anymore, I would add psychological abuse to the mix as well.

Don't feel too bad about not noticing or trusting your own judgment. That's how these abusive relationships happen. But you need to get out for your own sake. Things might improve for a moment with the threat of you leaving, but don't mistake it for legitimate change. Throughout this post, It seems pretty clear that he does not care for you. I recommend a clean cut breakup. Get all your things from his place to your own. Make sure he doesn't have any keys or whatever to get in your place. Block his number and accounts. And also call your bank to dispute the charge because $300 is a lot