Typically your wife would have to file for divorce or legal separation and typically the court will not order child support while you are living together and sharing a household. You need to consult an attorney to find out your rights.
My colleagues are correct. You are not in control if the criminal case as the alleged victim and if you were properly subpoenaed you cannot ignore it or you risk having a bench warrant issued against you.
Yes you need a lawyer in Colorado (if this is where your husband and children live). I agree with my colleagues. You need to file for a divorce or legal separation and seek court orders re parening time. Act quickly.
I can't tell from your question if you are talking about marrying the same spouse multiple times, if that is the case, then yes you can do so. You can not be married to 2 different people at the same time.