I've read all the OP's comments a few times and I just can't see what people are reacting to here.
One missing piece of the puzzle is- what has he been like during the day? Has he been an engaged dad and partner, wrangling the two children in a new place with you? Is he tired?
Pregnancy is a vulnerable time, and I don't want to criticise you but I find myself (also pregnant) empathising with your husband.
I've just come back from holiday with my husband and two small children. By the time we finally got them in bed I was exhausted. I just wanted to space out, with my headphones in, watching bridgerton or some other nonsense. Fortunately my husband understands and respects that I need time to decompress in the day. If my husband had repeatedly badgered me to 'initiate chat' and even started crying (which would seem a little manipulative frankly) demanding my attention when id been really clear I was spent and didn't have the energy... I can't say I would have physically run off but I certainly would understand the impulse.
You say he kept repeating his answers to you- doesn't that imply that you kept demanding and insisting that he chat with you after he had made it clear he wasn't up for it? Why does your wish for attention come before his wish for downtime?
Does he ignore you all day every day? Or just want some alone time at night?
Also I don't see how he is abusive. He didn't leave you and the children alone on the streets of some war torn outpost. It sounds like you were safe and sound in a holiday villa? He's a grown man, he went for a walk or a run. That's not dangerous. Surely you knew he was fine.
He told you again and again to leave him be and eventually he left to be alone. Then you persisted in phoning him- repeatedly- how much clearer could he be that he wanted some alone time? Why couldn't you respect that. Men are allowed boundaries as well.
He's a grown man, he went out for a break rather than get angry with his pregnant wife. And you call over and over when it's clear he wanted to be alone, cry, stay up, talk about involving the police.. it is dramatic. I personally would find it too much.
If you want to have a serious conversation about how your needs aren't being met in the relationship- then why was that the moment you picked? A moment when he didn't want to talk at all. When you were both tired. With no warning for him.
If you want to talk about needing more attention then ask him when would be a good time. Do it when you're not both exhausted. Don't call the police if a grown man wants a break.
I'm not supporting the husbands actions, but we don't know how many times he asked to be left alone only to have his boundaries ignored.