HELP! wait or move on?

Hey guys I can really use some advice.

Here’s some background info; my boyfriend is 27 and I’m 20. We have been together since I was 17, him 24.. 3 Years! He’s my first boyfriend and first partner.

Over dinner the other day we had a huge fight which led to a break up. We were at a restaurant and long story short, I happened to find messages of him sending flirtatious messages to a girl, 1 or 2 messages every 2-3 months. He knows her and she lives far out of state and said it was nothing like that and he would explain after dinner in the car. But he kind of started talking about and said he used to tutor her in church as well. To that, I disrespectfully replied “oh what else did you do to her while tutoring her?” Then he goes “okay now you’re just being disrespectful”. He then brings up another female friend saying, “oh I would compliment this friend saying she’s pretty and her body looks nice and she’s like my sister.” So i said, “oh really you would talk to your sister like that?” And he got so mad like he has never raised his voice at me and goes “you’re just disgusting and psycho. Why would you imply that about my sister and I.. it’s over” and stopped talking after that. When we got the bill, my wallet was open and he snatched the credit card he gave me a while ago back. So we get to the car and he types in my address into the GPS. the whole time we are driving home I keep saying “I’m so sorry I never meant to disrespect you I would never say anything bad about you or your family please let’s talk about this” and he just said “no, there’s nothing to talk about. Nobody disrespects my family or talks to me like that.” I continue emotionally rambling like “how can you do this to me” and trying to apologize but he doesn’t care. He pulls up in front of my house and says “go.” I’m still there trying to talk to him and explain and say sorry but he’s like “okay now you’re just repeating and embarrassing yourself.” So I ask for a hug and he says “it’s not going to fix anything but sure.” So he grabs me tight and says “bye” and after I get out of the car he rolls down the window and says, “I really meant it, it’s over.” And drives off. He then blocks me on snap and Instagram but not messenger where we always talk.

This happened 4 days ago. I just can’t believe it I’m in shock. He was talking about marriage 2 weeks ago and it’s like how can you end this over something that’s this small? I know he’s mad and I just don’t know whether to block him on messenger and start grieving or give him time to cool down? We have never had a fight like that, he’s never raised his voice at me that way and never blocked me throughout an argument or actually broke up. Last time he suffered a loss and took space from me for 3 WEEKS. This was a year ago.

I just wish I knew what’s going on. This whole argument started because of stupid messages to a girl. We had a great relationship, very involved in each other’s life and took trips together our siblings knew each other. I was finally reaching the peak of happiness and it shattered.