Boyfriend drama

So, my boyfriends been distant in the sense the last 3 days we’ve been making plans we end up not being able to fall through with them cause some ALWAYS comes up. I mean he’s definitely not doing it on purpose but why am I still so upset about it? I don’t wanna go off on him because like I said - it’s not his fault - but I really don’t know how to express my feelings to him without sounding like a total psychotic bitch...got any advice?