I (25F) am having a small birthday dinner next weekend just eight of my closest friends at a nice restaurant. I booked this place months ago, and the reservation is tight since they don’t allow more than eight people per table. My best friend Lila (26F) asked if she could bring her new boyfriend of two weeks. i told her NO because 1) the reservation is fixed and 2) I don’t feel comfortable having a total stranger at what’s supposed to be an intimate dinner with people I actually know. She got upset and said I’m “gatekeeping happiness” and that if I really cared about her, I’d make room for someone who makes her happy. I offered to celebrate separately with her and her boyfriend another time, but she’s still mad and now says she might not come at all.Some of my other friends think I’m being too rigid and should’ve just let him come, but others agree with me that it’s my birthday and I should get to choose who’s there.