A late spouse was most probably a very big part of your new partner's life and to get upset every time his/her name is mentioned makes for a very uncomfortable situation - for both of you.It is important, especially at the beginning of a relationship, to allow the widow/er to talk freely about his or her late spouse.
There's no specific time period one should wait before dating again.
Whatever you do, don't let others tell you you're moving too fast or waiting too long.
Make sure it's something you're really ready to try before taking that step. But five months was when I felt ready to at least test the dating waters.
He’s probably worried that they’ll think he’s moving on too fast or, perhaps, won’t be open to the idea of seeing him with someone else.
He might also be concerned that this new relationship will cause friction with other family and friends who are still mourning.