you have to have a serious talk to your husband. it's a possibility that he might not want to be married any more.
through his eyes you nag him, which may stress him out, he cheated on you, now he has to put the work in to repair the relationship and that is stressful, and he may not be willing to do. for him to secretly keep his facebook account tells you he isnt serious about his marriage. he couldve agreed to work out the marriage, but he told you he wants to separate for a while.
pray, i dont like to hear of a separation of marriage.