I think I tried to feel single before I actually did, and sometimes the line drawn between "married" and "single" still feels murky. We separated physically in September and decided to divorce in early November. I went on a date that, in hindsight, was essentially a one-night stand with a man I used to date in high school. It was a total rebound from all the stress and grief I was handling poorly and I felt really guilty about it afterward, even though XH and I were not "together" anymore. So, single Fail at that point.
I have been dating someone casually for the last 3-4 months and I feel "single" (our divorce still isn't final, although we are very close), but the longer I date him the more I realize that I am not ready AT ALL for another man to have an influential role in my children's lives. I have been friends with this man for a number of years so my kids know him and we hang out together sometimes--my kids are super young but we are not physically affectionate or demonstrative of being in a dating relationship at all around my kids. We have gone out to dinner with them before where the waiter has mistaken him for their father, and it REALLY bothered me. He also corrected my daughter once when I was trying to redirect some behavior and since those few incidents I have been less interested in having him around my kids, even if they just think we're friends. He has been totally respectful and apologetic when I feel he has crossed a line (really just with that one time of correcting my daughter), and I think my protectiveness over my children's exposure to other men in my life is not personal. They have just had a lot of change in their lives over the past year and I am figuring out appropriate boundaries for myself and them while I'm dating. I will have to be pretty serious with someone, I think, before I allow someone to have much contact with my children.
So, all that said, I feel like myself as a "single woman" and myself as a "single mother" are two identities which I need to keep pretty separate at this point. I am a single mother first and foremost, and a single woman when my kids are with their dad (2 days a week).