Yes, some individuals can think their spouse is cheating when they are not. Some individuals have a jealous streak because they are not confident in themselves or perhaps have been hurt by someone else in the past that did cheat. Once an individual has been cheated on previously they are more inclined to be more suspicious of their new spouse cheating. This is where good communication skills is most important in a relationship and you should feel free to discuss how you feel with your spouse and then listen to what they have to say. There are male and female spouses who do cheat, but in most cases the signs are there or eventually the spouse cheating will give themselves away or be caught. We all risk a spouse cheating throughout our life spans, but thankfully a higher percentage do not cheat. Your relationship should be based on trust and if you do not feel you have it then work on it by communicating with your spouse or, if you are having difficulties with thinking your spouse is cheating there is nothing wrong with seeing a psychologist to get you over your difficult time.
Spouse who cheat will never tell everything they did with their mistress, specially if this married man has to go back to his wife. He will tell some but not the one that you wanted to know. He might...
Try and find proof before you confront him, you don't want to accuse him and then find out he's not, you'll look paranoid and he'll feel you have no trust in him.
Yes. Every relationship is different. It depends on the actions of both parties. The outcome will be devastating. Lawyers will be involved. Financial hardships.