Am I obligated to keep him informed ALL THE TIME?!

We went for probably 7 months of my pregnancy without any sort of communication because he was mad at me for keeping the baby. And now that he's back and showed remorse and emotion, he expects me to always be in touch with him. Well This weekend is a huge family thing that we do every year up north at the family cottage where cell phone signal isn't always amazing unless you're at the end of the drive way or in the south wing of the house. Weird I know. But it's like I'm 28. This event typically has between 20-25 family members and we just mentally turn off and have a good time. Been doing this since the cottage was purchased collectively as a family nearly 18 years ago. So I'm not used to my baby daddy being back in my life tbh. So I will be honest. I didn't call him and say that I'm away for the next 5 days. I did however post on my Instagram that it was rest and relaxation with the whole family this long weekend and that i was excited for the fresh air and the ability to clear my mind before baby comes. (I'm 36 weeks) Well. Myself, a cousin of mine, and an aunt went into town because toilet paper and some other stuff was running low since we have 23 people under one roof lol. Well in town there is great cell phone signal. My phone went crazy. With texts, snaps, and dms on my Insta from my baby daddy losing his marbles because he hasn't heard from me. He called me a bitch in one message, accused me of hiding from him, said I need to call him immediately, asked me if I had the baby, said I'm so immature for trying to force him out of the picture, asked me where the hell I Am, said I will call the cops on you, demanded to know why I was ignoring him, told me that he needs to know where I am at all times, accused me of being a horrible mother, and a million other things. In total between text and social media, there were probably 30 messages from him. We aren't even together. And I'm already emotional. I don't even know how to respond. I'm just still processing all the sharp things he's said in the past 48 hours which all came through at once. Do I even owe him an explanation? I mean he's the one who left in the first place. And I told him I'd call him when I was in labour when that time came. Does he have the right to freak out on me? I mean less than two weeks ago, we weren't even on speaking terms. I'm not used to talking to him. He's really not my priority tbh