How to deal with problems of marriage life with a widowed person?

If he/she had had a very good marriage life with thier late partner, how should the new partner take it.. talk and listen to their feelings, or avoide talking it.. how to keep away from being compared.. simply.. how you should be "yourself" under this kind of situation

I think the partner should listen. This is a unique situation because unlike someone talking about their EX there is no chance of reconciliation with the deceased spouse, so it is cathartic for the widow to express her feelings.
If you make it a taboo topic then it will cause problems