I'm secretly going to a musical behind my boyfriend's back.
Why are you keeping this a secret though?
I love musicals, and I've been wanting to watch this one for so long.
I think that it is perfectly fine to seek out what makes us happy. However, hiding it from your significant other is not okay.
I don't have to answer to you, I'm going to this musical, that's it.
I think you should go to the musical if that's what you enjoy doing, I just don't think it's a good idea to hide it from your boyfriend. You should be honest with him about the things you like.