I'm glad you didn't beg. I get angry at myself for doing it in my last relationship (keep in mind I'm 23). I will never understand why I thought it would be a good idea to let emotion take complete control, and although my ex did it too during our relationship, it's really sad to be so desparate about something. It's a turnoff and love isn't desparation.
Now, the break ups and getting back together. There is something very wrong with that. I'm guessing he was the one to initiate it since he was the one to leave you in the end. When the break up happens the first time, I'm guessing it was maybe over a heated argument or a blowout, no matter how impulsive it seemed that should seriously concern you. The fact that somebody can do that on a whim and then taking advantage of the love you have for them to get back together with a quick I'm sorry is not healthy or mature. I used to do that when I was 19 and the end result of getting back together out of fear or lonliness is not what relationships are based on. You can guess how this one panned out: on and off until I got so sick I cut it off for good. I took advantage of the genuine love she had for me and it's horrifying to do that to somebody. I think that was what happened to you. It actually scares me that I could be so callous and disregard with somebody's feelings. I guess that is the definition of self interest or selfishness.
Being the dumpee is tough, because it's never something you both want. It's good and healthy to be out on your own and taking it slow, standing on your own two feet again. The dumper always feels like they are right, they won, you didn't make him happy and that he was right for doing it. It gives a false sense of confidence and while that may have helped him meet his new girl, more likely than not karma will come back around. The girl I met after I was a selfish asshole had my heart and I was pulling the same tricks with her that I did with the ex before and she kicked my ass to the curb very quick and now here I am stuck wishing I learned from my prior mistakes and full of regret. If it makes you feel any better, that will probably happen to him too.
Basing that on my experience and others I've seen, he did not feel the same way you felt for him. That's unfortunate but it is what it is. It hurts but the fact that you found this with somebody means that there are people out there that you can have this with. I just hope for you that it does work out for the better.
Be careful about that guy saying he's so glad you guys broke up so he could meet you. He sounds like he's putting the smooth moves on you. Just kidding.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.