1. Realize that he's not doing any of this intentionally to hurt you. I know you think you know that already, but keep that in mind whenever you felt like getting slapped in the face and you wanted to be mad at him. Realize that it's you slapping yourself, and that's your problem, not his.
2. Realize that he's not good in handling a lot of issues at the same time. So if you really want to be a good friend, lay off the selfish talks when you know he's busy. And you know he's busy. It's just not the right time to make amends. He's making amends with other people now, people more important to him than you. If you want to be selfish, the least you can do is to acknowledge the facts.
3. When sudden pain attacks, get busy. You've done this therapy before and it seemed to work. Keep a book in sight to keep you distracted, or be as engaged in anything else as you can. Bear in mind that during that one painful weekend, you came out feeling gorgeous and a lot smarter. Only next time, don't break down again the minute you saw them.
4. Remember that you always knew this was going to end, and now's the time...you already knew that even though you talked to him, things may not be fixed. And I'm not even saying this can't be fixed forever.
5. Be realistic. And that includes being realistic about the previous 4 things. All of them are logically true, but keep in mind you actually knew some of those truth are made up. You don't know which ones, but you know some of them came from the heart, not the brain. So don't beat yourself up if some of them sounds stupid.
6. Try not to let no.5 stop you from doing the right thing.