Maybe she have her own reason. It could be that something happened in the past that she lost her trust towards you. She will not just accuse you of infidelity if you didn't do anything in the past. What you need to do is talk to her, make sure that you help her ease her mind. Your the only one that can assure her that you are not doing anything behind her back. Or you can take her to those place where you go each day, so she can see what you are doing when your not with her. Also give her your schedule so she will know what you do each day.
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The word accuse is a verb: accuse, accuses, accusing, accused. The noun forms for the verb to accuse are accuser, and the gerund, accusing. Another noun form is accusation.
Start by asking him if something is bothering him. Tell him you've noticed some changes in him (or something like that). Ask if he's still happy with you or if you are doing something wrong (this makes it look like you think its you, not him). Flow withh the conversation after that. Be prepared if he is cheating though. Don't accuse him right away. That will just get him mad.
The abstract noun forms of the verb to accuse are accusation and the gerund, accusing.
To cheat (during an exam) is 'tricher' in French. To cheat on one's wife / husband is 'tromper sa femme / son mari'.
ANSWER: If your wife is been acting strange or the two of you are having a problem, the only thing you can do is be a man and talk to her. One mistakes we all do is when couples have problems, instead of facing and solving problems we avoid it and move on. So why not make time for your wife so the two of you can talk. Don't ignore the sign, or it might really happen.