Am I right to be angry at my boyfriend?

I normally see my boyfriend on Wednesday, but today I had an interview at 5pm, so we agreed that I would meet him straight after and get the bus to mine. He finished work at 4pm and told me he was going to the pub with some work colleagues while he waited for me. I got out of my interview at 6pm and I had a text off of him that basically said he was going to stay at the pub because all of his work colleagues were staying, so he couldn't see me. I'm really angry, shocked and upset that he has done this to me. I don't know whether this makes me sound like a pathetic, controlling girlfriend or whatever but I'm really not. He's allowed to go out with his work colleagues whenever he wants, and if they've asked him to go on a day when he usually sees me then we just see each other another day. It's the fact that he has just decided at the very last minute to change plans, and the fact that he has chosen to spend the night with the people he has spent the whole day with rather than see his girlfriend, who has just had a very stressful day. My mum knew he was coming home with me after my interview, and after he had finished work, so she decided to make dinner for us coming in. I had to get two buses home and all I wanted to do was cry. I got in and she asked where my boyfriend was and I just burst into tears. My mum is absolutely furious that he has upset me like this and that he has essentially messed her around as well. I really can't believe he has done this to me, it's so out of the blue. He's been amazing to me in the eight months we've been together and he has never let me down, always been there for me when I have needed him. We've never argued and he has never upset me. It just seems like his work colleagues have influenced him to stay and he just can't say no. I know he really wanted to see him. I told him that he has upset me a lot and he said that he would be upset if I did the same thing. He kept saying he would leave the pub and come to mine, I told him it doesn't matter as I didn't really want him to come after that. He knew I was upset, so I can't help thinking that if he really wanted to come, then he would have just left the pub when I said I was upset - but he didn't. He's now starting to feel awful about it and has said he can't believe how stupid he has been, especially after I told him that my mum was angry. I don't know whether it's right of me to be annoyed at him for changing plans at the very last minute, so he could spend the night with the people he has spent the day with rather than see me. He wants to see me tomorrow but he knows I have a really busy day and I don't know whether to just make him wait. Any advice would be much appreciated. My mum knew I was coming straight from an interview and he was coming from work, so we

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