All this said, it is important to not grieve alone, to not isolate yourself. Successful healing from the grief of heart-break involves connections with people; especially who care about you, who want to support and nurture you.
But remember that most people have not learned to recover from their grief successfully. Many of not most simply ACT as though they are recovered! And that act unintentionally encourages you to act recovered too! You don't want to do that if you want your broken heart to heal!