You will buddy. The only problem is that you still see and talk to your ex. For the next 30 days, you have to disappear from her life. No contact at all.
If you think about it, every time you see her or contact her, you get confused and hurt. It happens to all of us. If you stick to no contact, you'll be all right. Do it to keep your stability and sanity and life. Right now, you aren't acting reasonably, but you will soon be on the right track.
It is a hard process, but it does work. My ex and I have been on-off for 3 years... until I initiated the final no contact. I knew I was over her when I refused to get back together with her, and could ignore all of her phone calls and texts. I no longer care what she does anymore. I think she has hooked up with some of my friends to make me jealous, but all she did was make herself look kind of slutty. Today, I think that I am fortunate that she broke up with me, as she is acting like an immature child, and I no longer have to deal with it.
You just have to get to the point where you say to yourself, gosh darnit, I deserve to be happy. And this girl is not making you happy. So cut her out of your life, completely.
You obviously have tons of potential on the girl market, as you are picking up numbers and going on dates. However, I would suggest you take a break from all of that, because I think you are doing that to spite your ex girlfriend. You even admitted that you aren't ready for any of that.
To make your sense of self-worth and self-esteem higher, I suggest you complete all your classwork, spend time with friends, and maybe get involved in other activities/volunteering. I picked up a sport that I had left off when I came to college, and it has helped a lot. Not only is it a good physical outlet, but I've made great friends in the process.
Yes, dating is fun. However, don't start something if you're not ready. Just cherish your friends and work on you... which includes getting your classwork done. That should be your top priority right now. Stay focused and stay strong.
You said you don't want to go down the bad path. Stick to your word. Cut all ties and contact with the ex, and just start living your own life, how you want to live it.