Wow, sounds like a bit of a rollercoaster! I think (I know) that you did the right thing by breaking up with him, and I think that you know that too. The issue now is how do you handle the pain of the breakup, and while you know it was the right thing you still feel guilty about wanting to breakup with him.
First things first, you must take care of you. You and you alone are responsible for your well-being, and it seems like you have put a lot of time and effort into that. You are your own greatest investment, and while it hurts to cut those ties, it seems like he was holding you back. Both partners should be getting their needs met, and if he is holding you back from getting them, then he needs to understand that you need to do what you need to do for you. On that note, he is also the only person who is responsible for himself, and it is not up to you to take care of him. Breaking up was something that needed to happen, not something you “did to him”.
You care about him, and you know the breakup hurts him, therefore it feels you are hurting him by not being with him, and it becomes your responsibility to make him feel better because it was caused by something that you did. However, that is not how it works. He is responsible for his own feelings, just as you are responsible for yours, and you are not doing him (or you) any favors by sticking around.
People change all the time. Change is natural, change is good. Nothing lasts forever, not the good or the bad-so embrace it! You are only 22, and it seems like you are doing a lot to get on the right track and you recognized that you needed to change things for yourself, and it also seems like you kind of got roped into the relationship. You are only seeing the loss right now, and not what you stand to gain so you might not see that, but the more you continue focusing on you the clearer it will become. Ask yourself, what did you want in the relationship that you couldn’t get? What did you wish would change but didn’t? What did you want to do while with him, but couldn’t? Then, go get it! It will help you start focusing on what you have to gain instead of lost.
There is absolutely someone out there who you can be happy with. Your relationship clearly wasn’t working- saying that you will never find anyone as tolerant or affectionate is akin to saying that the only thing you have to look forward to is an unsatisfying relationship. That’s pretty bleak! Frankly if you were to stay you would probably be angry with yourself, if not now, then down the line. For now, just focus on you and all of the things you want to include in your life. You have a great path ahead of you, and I think you know inside that this was what you needed to continue down it. This is one of life’s lessons, and some of us never learn it, so be happy you’re doing it now. Hang in there, and it will all fall into place 

Oh dear, I’m so sorry! It sounds like you’ve been through so much the last 6 months! I’m sorry that everything happened like this it seems like this has all been very much a whirlwind.

That being said, I do think that anita is right in that he is still not in the right place to be in a relationship. He broke up with you somewhat out of the blue it seems, and then 6 months later he says that he wants to be back in the relationship while insisting on telling you about his relationship with someone else, and then ignores you when you call him to do what he said he had been wanting. This is not fair to you, and it frankly seems like it is only serving his needs.

Its only natural to miss the relationship or struggle after a breakup, especially one that you were in for so long and also one that you had no time to prepare yourself for emotionally. It seems like you had really invested in the relationship and given of yourself but you are right- you cannot change him; only he can address the issues that he is coming up against. That being said, you do still care about him and I am afraid that if you try to be there for him at this point you will only end up getting hurt. It is comforting to be with the person we love and miss, but I think that at this stage he is not in a place to be able to give of himself and be with you the way you need to so it will be one-sided.

When you break up with someone, it can literally feel like you have lost half of yourself, and you love him and that part of your life so you want it back. I am not saying there is no hope for reconciliation, but I am saying that now is not the time. He needs to be on his own to work through everything and you cannot be the facilitator for that. If you are getting the feeling that something is wrong, you are probably right. If things ended badly before and you ended up getting hurt, it is likely that it will happen again especially if the circumstances leading up to have not changed.

In the meantime, just focus on you and taking care of yourself. Going back to what hurt you will not help you heal. If things are meant to be worked out, they will do so naturally, so don’t pressure yourself to make anything happen or tell yourself something is wrong if it doesn’t.
I hope that helps and best of luck x