Gomer has been unfaithful to Hosea. Israel has been unfaithful to Jehovah. The longing of Jehovah and His will for Hosea is that they both find reconciliation with their loved ones.
"I will give her her vineyards from there, and the Valley of Achor as a door of hope; she shall sing there, as in the days of her youth, as in the day when she came up from the land of Egypt" (Hosea 2:15; NKJV).
There was "a door of hope" for Gomer and Israel. Whether they walked through it was up to them. Walk through "the door" that is Jesus and be reconciled to God today (see John 10:9).