The question is whether you are unreasonable to be annoyed that your partner is essentially giving you the silent treatment and sulking rather than having a conversation about what's wrong? OK, YANBU, and yes I would also be very annoyed.
If he wanted time and space to get over whatever's bothering before we talk, he can just say so. (Of course, if he asked to talk later and I kept pestering him then I could see the point of blocking me temporarily, but you've said you don't normally test or call him at work so it's irrelevant here.) HOWEVER, as the two of you have a child together, it's not OK for him to be intentionally out of contact with you, or vice versa.
He says I didn't do enough to try keep her in preschool another year. I done everything I could but the professionals think attending the learning centre is the best option for her. Did the two of you disagree on how to handle this and you did what you wanted behind his back, and/or prevented him from doing what he wanted? If so, the two of you still need to discuss it and find a way to move on. If not, any fault is equally his but the important things now if your daughter. I hope he's not making any of this evident to her.
He really needs to step up and be a parent, but you won't be able to force him to do so. And it would probably be a great idea for him to get professional help handling his emotions, as he's tried and failed to manage them himself - but you can't force that either. If the two of you split up, you won't, unfortunately, be able to make him do his half of the parenting if he doesn't want to - but if he shirks it, make sure he at least pays his share of the costs.