@Rhino126 it’s not that uncommon.
If a person divorce, it can get it over with their first marriage and then have a second love story and a second marriage forgetting easily the first story.
But in the case of an untimely death that split the couple, the remaining one will never say goodbye definitively to the first person...because it technically didn’t happened, probably; so they can try to move on, find a new love and really mean it...but there will still be that “lingering feeling” about the first husband/wife.
Often the new partner knows about it too (and if they are “human inside” they’ll understand).