Emotionally immaturity is a dealbreaker for me. It isn’t a “I am who I am." It’s a "I don’t care to learn how to deal with my emotions enough to have a healthy relationship with you." It isn’t a "just accept it." It’s toxic behaviour. It isn’t something anyone has to deal with it. It’s unnecessary stress & drama. It isn’t cute or funny. It’s childish. No healthy adult has the time or energy to deal with an emotionally immature child in an adult body. Grow up.