My boyfriend ditched me for the gym when we had plans? Am I overreacting?

Anonymous
A few days ago my boyfriend and I realised that we both for once were off work on the same day (today) so we decided we would see eachother.

Yesterday we made dinner and he stayed the night. A few days ago he screwed up and hurt me so we talked and solved it, had dinner and watched a movie. Right before we went to bed he told me he was going to the gym the next day. At first I was a bit annoyed since I had cleared my schedule to be with him but I then realised that we could hang out afterwards. Little did I know he had made plans with his friend (same friend he's going to the gym with) to go see a movie instead.

So after I had made a really nice breakfast in bed he decides to tell me. He noticed that I was disappointed but he didn't realise why, and I knew that if I told him why he would feel bad the entire day.
Am I right to be disappointed? What should I do?
My boyfriend ditched me for the gym when we had plans? Am I overreacting?
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