It's not really, A1980. It's about a woman trying to come to terms with what her partner has done. She wasn't expecting him to leave, but he did. She's asking herself how he could have done this. You're asking the same things yourself and you're (in my opinion), re-writing your history a little, trying every which way to portray the man who's hurt you as somebody 'not so bad' who really, deep down, is committed to you. You want the posters here to agree with you because that would give you 'strength' to hold on, it would bolster you.
I'm truly glad that nobody here is doing that. It would be a huge disservice to you. Your pain is palpable, everything you write screams it out, but you're not facing it, not really. You're believing somewhere that you've stopped accepting his behaviour, that you won't accept game-playing any longer and that he would need to come back to you and do the running. What you're not prepared to believe is that he won't, that he doesn't care for you - not on ANY level.
In a way, he's done you a huge favour, he's stopped contact with you - completely. He could keep you dangling so easily because you want him so much. His refusal to lean on you, stay in touch, text you, ring you, whatever, is what will eventually set you free. Well, it will set you free if you let it. You really need to stop dwelling and stop wallowing now. It's over, OVER. It really is. What will you do now to move on with your life?
If I were with you now, I'd give you a hug - then I'd give you a shake and not pander to your role playing of devoted girlfriend. You're not his girlfriend, he's not capable of having one so stop writing yourself in that role. There will be a man out there for you who is just right. He can't find you right now because you're not ready and you're not the person that you really are at the moment.
Please A1980, take stock, objectively, get some help and stop obsessing over this muppet. He doesn't love you, doesn't want you and doesn't need you. You deserve someone who does, you really do. This is said with kindness and compassion - get a grip before you alienate all your RL friends and family and start getting over this non-entity.