People go through mourning at different times and different ways. Keep doing what you're doing. Funny the sadness in your spouse comes out when you started dating.
All those dates were wonderful. You know the pond is stocked when you want to go throw a line or two out. As it was said before, you've changed, are aware and educated about what you do and don't want in a relationship. What you want and/or need in a date is a different story. Address your boundaries up front. It sounds like "Hello beautiful.. You're wonderful. I'm not ready to do anything but focus my all my sensuous attention solely on you in the here and now." Well.. something like that.
A date is a date is a date. If it's fun, hurray! If it's a chore, fig it!