I guess concerning dates, you should do whatever you feel comfortable with. Certainly, if he is active on match.com and having dates then you should feel no guilt doing the same, if that is what you want.
counterpoint:
"If he is actively having sex with other people, then you should feel no guilt doing the same".
That statement, wouldnt work for me personally. So it would seem that the overall concept in general, of "if he's doing it, then you shouldnt feel guilty about doing it too", seems flawed to me too.
My current status: june 2006. Wife ran out and filed D. Finalized Jan 11, 2010, after 12.5 years M. 3 wonderful sons caught in the middle