Crystal,
You make it sound like dating a separated person is cheating. There is a huge difference. There are many degrees of separation and there are many reasons for divorce! I think that if the 2 parties in the marriage have decided to go their separate ways and actually DO split up and move apart and DO NOT continue a sexual or intimate relationship, and follow the separation with divorce proceedings, then there is nothing tawdry or evil about either of the 2 dating while they are pursuing the divorce. Remember, this is assuming they have already decided to call the marriage off and not repair it. If there is ANY chance that the 2 will get back together or if there's a glimmer that the separation won't last or that the divorce will not happen, then I would be very wary about getting involved with that person.
I would feel better knowing that the separation was mutually desired and that the 2 had been apart for some time. If it's too new, then all bets are off. I would also not feel good about getting involved if the separation was not amicable -- too messy and volatile a situation in which to develop a new relationship.
In some states, family law is a complex area and the divorce process can take "forever". It would not be fair to expect people to remain alone during a 2 year divorce, would it? Marriage should never be a prison nor should getting out of a marriage condemn a person to a miserable and lonely existence.
Just my nickel's worth...
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There are spirits all around us - JBB