My boyfriend bought me an expensive present that I don't like. What do I do?

For my birthday, my boyfriend bought me this gift certificate to a spa. He sent it in an email so he hasn't seen my reaction yet. Now we are both on tight budgets, and I told him before not to spend much money on me (like 20 dollars max). I even suggested he get me headphones that I can run in. Well he spent $150 on this, but the worst part is, I'm not even the type of girl to go to a spa. We've been dating for a year now so he should know this. I don't want to hurt his feelings, but I felt like crying when I saw it because it's like he doesn't know me at all. Maybe I'm just overreacting and I should just be grateful that he wanted to spend that much money on me, but it's a lot of money going to something I will never use. What do I even say to him? I don't think I can accept this, but I don't know if it is returnable either.
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Well I talked to him about, and he said he would try and return it. I feel pretty guilty (I mean who rejects a nice present like that), but he's been very understanding about the whole thing.


I imagine he's going to have a fun conversation when he calls the spa: "Yes, I would like to return the giftcard I got my girlfriend for her birthday. You see, she has the fear of going to spas and doing 'girly' things that I wasn't aware of. Yeah, she's weird like that, but hey, that's why I love her."
My boyfriend bought me an expensive present that I don't like. What do I do?
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