It is very important to remind you of Tawbah (repentance) and the conditions of repentance. Separation is not considered Talaaq (Divorce). However, if you mean that he divorced you then you are considered divorced. This comes with one condition, which is that your husband does not return you back until the end of the Iddah (waiting period). The Iddah is three periods (menstruation) after issuing of Talaaq (Divorce). If you have already finished the Iddah, then you can marry the new man according to Shariah. However, it is not recommended to marry another man while observing process of divorce