Best friend or new boyfriend???

Hello anyone out there,
I’ve been dating this wonderful guy for about 4 months now and his birthday is coming up this memorial day weekend. However, my best friend and I have had this out of town trip that we traditionally take every year, only we planned it for this very same weekend before things started getting serious between this gentlemen and I. I’m totally conflicted here. My best friend already made it clear she supports me if i choose to stay home to celebrate my new bf’s birthday but what’s the moral thing to do here?? I love my best friend its a sisterly bond we cherish, but I do want this man to know i am serious about our growing relationship. Take the trip or stay for bf birthday?? Please any sincere genuine advice is much appreciated!

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