The fact that he wasn’t very apologetic is concerning. I would hope that your boyfriend would feel awful and be extremely apologetic afterwards, trying to fix the situation but at least from how you explained, it doesn’t seem like that happened. I assume that he’s aware how your mom feels at least a little and that he knew this dinner was very important to you and your relationship together. The fact that he already doesn’t care doesn’t seem like a good sign. You can’t make someone care if they don’t. If you don’t want to call it quits immediately, at least don’t let him get away with a half-ass apology and have a conversation about what happened. The way he reacts and the things he says will reflect on how he is as a person and that will help you decide how to proceed.

Also, I don’t want to sound like a mom but I’m 21, close to your age, and I have dated a guy who was a lot older than me in the past. It was a terrible decision that I really regret because the guy definitely took advantage of how naive I was. I just want you to think about why he would go for someone who’s so much younger and in a totally different stage of life. I’m sure that you’re an awesome girl but he’s 26, that’s old enough to get married or start a family or any other big life decision. You’re not even close to the point. If he was really mature, I would think that he would realize how hard that could be. I’m not saying to break up with him but take a step back and try to be sure that you aren’t missing any red flags. Just be careful!