Do I have to testify

If the D.A. or other prosecutor has subpoenaed you to court, then refusing to show up could cause a warrant to issue for your arrest.  Whether that is likely in your case should be asked of a qualified criminal defense attorney.  The Fifth Amendment gives a privilege against SELF incrimination, allowing you to refuse to anser if the answer could incriminate you; from what is provided, it is hard to see how it applies, but you should confier with criminal defense counsel. Another privilege might apply, however.  Under NRS 49.295, a spousal privilege attaches, under which, generally, neither a husband nor a wife may be examined without that person’s consent in any prosecution or civil suit against the other, and neither may be examined during the marriage or thereafter, as to any communication by one to the other during the marriage, without the consent of the other.  In other words, the “refusing to testify” privilege belongs to the spouse called to the stand, to invoke or not, and the confidential communication privilege belongs to the other spouse. Again, you should speak with qualified criminal defense counsel.