Hi Happiest,I'm back.
I've read your other thread. It seems like thsi guy will look for any reason to break up with you - if he says a is wrong and you change it, then b will be wrong. You sound very apologetic, and like you're trying to adjust yourself to be perfect for him. But the thing is, with guys like this, they'll always find something to pick at, something to chip away at your self esteem, he will always treat you like this so that you're constantly running around after him.
In a healthy relationship, your partner supports you no matter what, not accuses you of being needy. Did I read that he'd gone out for drinks with a female friend, told you he'd be back early (by midnight iirc) and rocked up at 6.30 am then got angry with you for being upset??? 
You say that your DP has turnedinto someone distant and cold, I know it's hard to switch off emotionally, but in your head, why on earth do you want to be with someone like this?
It seems like you are still seeing your relationship as it was a year ago, but that your DP sees it differently and hasn't bothered to talk about it with you.
The other thing is the way in which he left his xw, and the things he said about her. It really speaks volumes about the type of person he is and his level of emotional maturity no matter which way you look at it. Either he was lying about her and used the lies as justification for leaving her or he is an idiot who having got married for the wrong reasons, has not been able to accept any responsibility for it and the subsequent fall out.
1.5 years is a not insignificant amount of time to spend with someone, but you don't have children and are very young. You also sound like you have a lot going for you careerwise. Why do you need to be with an emotionally bereft man like is (and at this age it's unlikely he'll change)? Let him go, and if he loves you, he'll be back and apologising for treating you in this way. You can do so much better than this. If it's like this after 1.5 yrs, when you should be head over heels still, I can assure you that it can only get much much worse. This is not a man who respects you OP.
I hope I haven't been too harsh - I know you must be hurting.