Let's get it out of the way. If you are on this site looking for private investigative services it is quite possible that you suspect infidelity in your relationship. If you suspect it, then it is also likely that your subconscious picked up on clues. Unfortunately, it is also likely that it has and/or is occurring...
People not directly involved may "simply" just say break up with him/her. True...then you don't need our services. But then there is reality: Divorce? Child custody? Support? Property? Unnecessary and escalating costs? A QUALITY investigation can make or break your case in court.
What will get the results you are looking for? (This is where it gets politically incorrect) Will you be seen as a red faced, yelling, angry and "jealous" husband or a wild-eyed and "crazy" accusatory wife? Without any supporting evidence...
You can have a professional report and experienced investigator in court with time stamped video, photographs, and sworn testimony. If you were a judge, how would you rule?