I am sorry for your loss.
It may not be any help, but my uncle complained of much the same thing. Women were hitting on him within a week of my aunt’s funeral.
I don’t know that there is any hard-and-fast rule on how long one should wait before asking a widow out. “Whenever she’s ready”, I guess, but there is no generally accepted social signal nowadays that says one is back on the market. It used to be one was in “deep mourning” for a year, and after that, it was up to the widow.
One interesting thing my mother, who is Grand High Arbiter of Everything That is Correct, said is that one is automatically no longer in mourning once one becomes engaged, and this is considered entirely proper. It is not a social faux-pas to become engaged while in deep mourning. As is said, some women look good in black.
You can and should date when and if you want to, obviously. If you are not wearing a wedding ring, that means you are not married (or engaged), and many men will draw conclusions from that. That doesn’t mean necessarily that they are being disrespectful of you or your late husband - it is kind of the nature of the beast.
Regards,
Shodan