Sean should've met another woman at the end
That would've made Sean and Will's relationship even more special, they both helped each other.
shareI don't believe that Sean was ready for that.
It is not impossible that he fell in love again in the future, but we don't know anything about that.
However, an ex-neighbor of ours lost her husband to cancer thirtyfive years ago.
And as far as we know, she's never had another man in her life or wanted another man in her life since then.
Thus, it is not that weird to me that some people stay single after their spouse dies.