“Hey (pet name). Why aren’t you talking to me? Not like you. Bit childish don’t you think?”
As a detached observer from the situation, I can honestly say this gave me the rage.
He dumped his gf of two yrs by text, told her there was no need to reply (i.e. I don't want to deal with two seconds of your confusion, upset, anger etc., I just want you to go away without a word) and now asks why she isn't communicating with him and accuses he'd if bring childish!!!!!!
Wtaf? Had this guy got some kind of mental illness, personality disorder, something that makes you utterly utterly selfish, lacking in empathy, unreasonable, ridiculous. There are toddlers with more self awareness, rationality and less selfishness than this guy.
He would've been a shit partner, op.
He has been a bullet dodge. Imagine how he could've acted when you had eg mortgage and kids.