Bf going to Vegas without me?

Would you be upset if your bf or significant other was going to Vegas without you?

He decided to go bc his friends is going for a friend birthday, we were suppose to go bc we didn’t have a baby sitter . His friends are going sat-tues. He told me he was going and invited my brother so I won’t be as mad and I can trust him going. It’s not even about any of that why I’m upset I’m just upset bc he’s going without me and I’ve never been to Vegas. I don’t get any alone time away from my child as in me time . I’m always with our child while he’s out and about. We are at parties Im watching her while he enjoys himself. I do everything and I feel like I need a break. It’s just the fact that he didn’t include me or just to say he’s not going which he said in the first place. I feel like he should of rethought about it and at least not go because I can’t go.