Feng shui master said that the east house and the north house of my house can't be connected together.

Do you have a map? Let me take a look at it for you. If the north house is the main house and the east house is the wing or other shorter rooms, it is best not to connect them together. Feng Shui calls it the teardrop room. Regarding Feng Shui, if you believe it, you should take it seriously. If you don't believe it, what others say is nonsense, but whether you believe it or not, it exists.