Is it a buzz kill if your SO doesn't want to dress up for Halloween?

My boyfriend known before we started dating that I love Halloween I plan my costume months in advance. He's acting all surprised saying he didn't know it was important to me and he hasn't dressed up since he was 15. Now he's going to dress up but only because he feels obligated to... I told him not to do that because he won't be happy and neither will I knowing the reason he's doing it. Now the enjoyment has been sucked out of it for me.

We've been together 2 years. 1st year we didn't spend together because I lived 2 hours away, last year I was pregnant so I didn't feel well.

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Is it a buzz kill if your SO doesn't want to dress up for Halloween?
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