Too tired to see me but then goes to the gym?

So, basically, I asked my boyfriend if he wanted to hang out today and he told me no, that he would be too tired and we could tomorrow. He has work, so I understand how it is. However, then I find out he went to the gym immediately after he got off. To me, it's like, you're too tired to see your girlfriend after work, but you'll go to the gym? He's also gone to the gym nearly every day this week, so it isn't like he never gets to go. Any opinions on this? Thoughts? Thanks in advance.
Too tired to see me but then goes to the gym?
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