She's cheating on you but not with a guy, it's with your girl best friend. One day you go to your apartment after work and see them on your bed. (The one in blue and white is your girlfriend, the other is your best friend)

You and your crush ends up getting stuck in an elevator somehow after splitting from your group. You like her but she is oblivious to your feelings. you're a male.

She is your best friend since primary school and you two are roommates. You have had a crush on her ever since then but never worked up the confidence to tell her. She kinda suspects that you like her but doesn't say anything about it. You are a male.