Disclaimer: Tolkien's the genius, not me.
Their source for news and gossip from Doriath was for the most part Mablung, who traveled often to visit them on Tol Galen, often bearing letters from Melian, or gifts from Thingol. Beren was glad for this link to Menegroth, for Lúthien's sake, but for his part paid little attention.
When he let himself think for too long about why, something deep in his chest started aching, old losses hurting with the same sudden pain he felt in his missing hand sometimes.
There were no messengers to visit them from Dorthonion. No one came bearing letters written in Emeldir's hand.