Am I selfish for wanting so spend time alone with my boyfriend?

I have had a few very stressful weeks and months with university. I have my last exams tomorrow and on Friday. I am going to spend Friday and Saturday with my boyfriend and I‘ve been excited about it and looking forward to it for a while. now he told me that it‘s one of his friend‘s birthday on Friday and he wants us to go there. I feel so selfish but his friend‘s girlfriend doesn‘t really like me so I would feel so uncomfortable.. I just want to spend time with my boyfriend. I agreed to go but I feel so sad now. What should I do?

Am I selfish for wanting so spend time alone with my boyfriend?
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