First love - forever?

Ari • Have been with my SO since we were 14. We`re both turning 21 this year. ❤️
I have been with my first boyfriend since we were 14 and we are turning 20 later this year. Everyone always told me that it's bad to stay with one person your whole life and need to venture out. However, I'm completely happy and I know he's all I need! I want to know if anyone has an opinion on this and if they're in a similar situation. -happily in love!-