UPDATED: right to be annoyed?

My boyfriend went on holidays last week with his family I haven’t seen him for almost two weeks. On Sunday he said we were going to see each other so much this week because he had a week off college. He kept carrying on about how much work he had on Monday so I said I could come over Thursday and we could have a study date.

Apparently he asked his mum and she said no because he has work to do, he sent me a screenshot of the message but not of what he actually sent her just her response. We organised to see each other Saturday because he said to me he is going out with his friends Friday night. Now when Thursday came and he goes that he’s going to a friends house and I said that is his mum fine with it, and his mum said yes. And he’s like yeah she said I can’t stay late. Next minute his going out with his friends and drinking and staying the night at his friend’s I’m just annoyed. That he was complaining about what he had to do and that he couldn’t see me and we were actually going to study but he was fine to go out and drink with his friends.

This has happened so many times where he just doesn’t stick up for us to his mum or that he just flakes on me but then does something else. It just gets to me

UPDATE: I didn’t want to message each other like we normally do because I needed to cool off. I told him I didn’t want to talk today. And he asked me if did something, he then messaged me again and said if I’m annoyed because his mum let him go out with his friends but not see me. He basically blamed his mum and said she’s not a very friendly person and he’ll get to the bottom of it when he gets home. Sounds like it’s just an excuse and he is blaming his mum and he did nothing wrong