I'd like to add to what Ryan has written. What your boyfriend has done shows me that he's unconscious about what he's saying and doing. That he's probably denied how much your arguing and putting yourself down was getting to him, and then he finally just broke, and flipped into a damage-control mode. That's not uncommon for men when they're young--or women too. Now he's hiding from his grief about giving up on his love for you by trying to transfer it to another girl as quickly as possible. And that probably won't work very well, unless she's a lot like you but lacks your low self-esteem and panic attacks.
But I also don't think you can "move on" yourself while continuing to hold out hope that he'll realize he's just fooling himself and want to try again with you. What you CAN do instead of "moving on" is to shift your attention and central focus of energy onto getting yourself into psychotherapy to work on your abusive past, so that you can become more ready and able to cope with a man that loves you and you love too. If you do that, then you'll be investing in the future that you want--and the life you will want in which your ghosts from the past don't have as much power to disturb you as they do now. Those effects will NOT just go away if you ignore them. So the BEST thing you can do for yourself AND for your boyfriend is to get yourself into regular counseling with a good therapist to gain in consciousness, personal strength and self-esteem. And don't use that as a bargaining chip to try to get him to come back. Just let him know that you're NOT "moving on" but moving into working on your personal past with professional help--so you will be ready for him or for somebody else if he's really through with you and needs to move on.
That's what people do when they're unconscious and don't want to feel the huge loss they've just given to themselves and their partner. And IF HE SHOULD COME BACK in just a few weeks, DON'T give up on therapy, because you'll lose your balance for sure if he comes back, and then you'll start believing again that he's the center of your life and the only person you need to be in paradise--and that won't work to stop your past from terrorizing you unless you stay in therapy too.
The therapist needs to become a new CENTER for your life, because you need him or her to help you build a better CENTER in yourself. So projecting that center back onto your boyfriend again won't do you enough good in the long run (like a few weeks when you have another episode), unless you have the therapist as an independent-of-you center who's working to engage you in building your own center. In the long run, you don't need THIS PARTICULAR guy as much as you need a good solid center for yourself, because then you can have both a good guy and a good center.