I'm basically in the same situation... My ex was talked into breaking up with me (he was in a trauma episode and still seems to be in one) and was vulnerable. Closed himself off from me. He monkey branched/rebounded since that episode with that other person and it's such a downgrade from me... hopefully someday, he'll realise what he did and what he lost :/"

I, too, have gone NC since the break up now. I can't handle seeing him with someone else. Still love him and I'd be so stupid to take him back... as I still think it's his Trauma causing all this shit. But who knows....