I donʻt want to simplify things too much, but if you have so little trust that you decide to invest in spy devices (or professional detectives) it seems to me that one of two things must be true. First, you may have long standing trust issues that are not specific to your partner and you would probably benefit from therapy—before you destroy your relationship. Second, your lack of trust may stem directly from your relationship itself, which is to say the secretive, unexplained incidents or behaviors of your partner—and/or your partnerʻs resistance to answering casual questions that shouldnʻt raise red flags. In the latter case, it seems that the relationship is already irreparably damaged and the essential question is your exit strategy