too close

a friend told me once that, ''when we are too close with that someone, we cant be a couple''

so how true is that? what does it mean by TOO CLOSE?

do you know it's easy to understand how becoming romantically involved:-

when we already seen each other at your worst and have learned to accept each other flaws.

there are no surprises as we already know each other friends, family and dating history.

It's easy to communicate with one another. After all, you've had practice sharing your thoughts and feelings with one another in a risk-free relationship.

am i rite?