The romanced warden Thom only stays for one year and then it's clearly stated that some point he dies.
Pardoned
Thom Rainier was shown mercy when none was deserved, and set on a path of redemption. This gift, so compassionately given, needed to be shared. Freed from his obligations to the Inquisition, Rainier travelled Thedas, giving hope to the condemned and the forgotten. In the deepest prisons and pits of Thedas, he found, if not goodness itself, its potential. By showing faith in those who had one, Rainier lifted them up and made them into something better than they were.
Pardoned, romanced
And always by his side was the woman he loved. Held up as the inspiration for change in Rainier himself, and across all Thedas, her legend continued to grow.
Warden
After the Exalted Council, Thom Rainier bid farewell to his friends and went to Weisshaupt fortress to pledge himself to the Grey Wardens for good. While he was rarely seen in the years that followed, some said they encountered Rainier in far-flung lands, their accounts always similar. Rainier carried out the duty of the Wardens, but always found time to help others along the way. Sometimes he served as a shield for the defenseless. Other times, he spread simple cheer among children with gifts of small, carved toys.
Warden, romanced
After the Exalted Council, Warden Thom Rainier was summoned to return to Weisshaupt fortress. Reluctant to leave the side of the woman he loved, Rainier ignored the Wardens' request for nearly a year. When the messages became too urgent to ignore, he left for his duty, promising to return. Weeks turned to months, and then years. The promise remained unfulfilled. Eventually, a gift came to the Inquisitor, unsigned, with no accompanying letter. Wrapped in aged leather was the Warden-Constable's badge and a single pure white griffon feather.