Dating after separation

My husband and I are separated and have been since July 2010. I have obtained a 50B against him. The separation is permanent and there is no chance for reconciliation. Is it legal for me to start dating. Would this have any negative impact on custody or alimony. Information I have found about alienation of affection and criminal conversation all state that it had to have been started or occur before the date of separation. Is this correct. Please advise.