would i seem crazy to ask my boyfriend to delete his ex girlfriend on snapchat?

idk why they need to be friends on snapchat, i deleted her off of mine because she was always the first one to watch my story and it was kinda creepy. i feel like she wants to like see what we're doing and im sure she still has feelings for him. i trust my boyfriend 100% but i just dont see a reason why they should be friends on snapchat anymore. do i seem crazy or is it reasonable? comment what you think