A relationship can be successful, when it is two-sided; when both partners compromise, sacrifice, put efforts in the relationship. It can never be successful when one partner expects too much of the other; when one thinks that the other should accept him with all his conditions. When there is no unconditional love in a relationship, it doesn’t last long.
I don’t agree that if you reach out to someone for friendship, their partner or children, or your family should also be their friends. Friendship is a complex thing, and it is not necessary that ‘their’ family will also accept you or you accept them as friends. However, occasionally meeting the family is another thing. That can be done.