I'm thinking of sharing a bed with a past crush while in a relationship
Why would you share a bed with an old crush if you are in a relationship?
I want to do something crazy which is against my usual character.
It's not okay to share a bed with someone you are not in a relationship with. Even if it's platonic it could make your boyfriend feel insecure.
I'm going to go do it anyways.
How would you feel if your boyfriend shared a bed with someone he used to like? If it would upset you then you should reconsider what you are planning to do.