It’s funny that the one post I agree with is the other married person over 35 on this thread.
There’s a lot of implied “spoiled hipster, millennial, never amount to anything” in this thread without any actual facts that imply he’s any of those those.
Key facts in his favor are:
1) he’s met your parent before
2) this was a normal lunch, not a special occasian.
3) it was his friend’s birthday, not just a random night.
4) he messaged you that he wouldn’t make it, which is considerably better than just standing you up.
5) he apologized and feels terrible
6) you said he doesn’t normally do things like this.
No doubt what he did was wrong. You have every right to be disappointed and upset. It is appropriate to calmly tell him you’re disappointed and why. But if you like him, that’s it. Move on.
If he’s young, then his friends are likely extremely important to him. If he’s presented with the option that he has to choose between his friends birthday and lunch with his parents, then he’s probably going to choose his friends birthday. And he’s not totally wrong for doing that. But it doesn’t sound like that happened. It’s sounds like he tried to make both you and his birthday friend happy... and failed.
My parents would laugh if my wife did this when I was younger. Her parents are beyond religious and do not drink at all. I did this when we first started dating, but I showed up hungover. They laughed at me the entire lunch and at the end they told me I should have slept it off because we could have rescheduled. Yesterday was our anniversary and we spent the entire day laughing about things like this. Considering everything we have been through, this type of incident barely registers.
Someday you or your future husband will lose a job at an inopertune time. One of your family member will come down with an illness and you’ll agree to empty out your savings to help pay for a procedure that will eventually save that family members life. Then you’ll struggle to pay your mortgage and fight over that for months. And when something like that happens you’ll look back on this post and laugh that something this insignificant stressed you out.
Point is, this guy sounds like a fairly reasonable guy and you seem to like him. You didn’t say he has a history of this stuff, and if this is indeed his first offense, then I’d let him know you’re disappointed, but don’t rub it in his face. He probably already feels bad enough. If this is the worst thing he ever does to you in your relationship, they you might be the luckiest woman on the planet. But if this turns into a repetitive behavior, then revive this thread so everyone can tell me how wrong I was.
Good luck.