Let's start with the fact that betrayal is the final stage of complex processes occurring in the family. After all, it doesn’t happen that he loves his wife with all his heart, but decides to start another relationship on the side. Life, of course, is capable of throwing up such metamorphoses that you can’t imagine on purpose, but still, most often, infidelity is preceded by periods of alienation. Alienation is very A common phenomenon is “being alone together.” This is when people no longer have enough spiritual closeness, but something remains in common - children, housing, mortgage, or, as the hero of one of the Soviet films says, “you and I are deeply related - we have a common spoiled life.” And then people allow themselves experience positive emotions on the side. Sometimes they put a good face on a bad game, calling it treason. It's a game of who's most likely to screw up. Sometimes one of the spouses, however, does not feel the alienation of the other, often, by the way, out of little attentiveness to him. As for marital fidelity, it was initially necessary for a man to be confident in the consanguinity of his children (there are wise people who gave up on this rule so as not to bother every time, and their relationship goes through the mother)) And in the fiction of the 18-19 centuries - a deceived spouse, love affairs - a very common theme. Apparently, these are the consequences of the fact that bourgeois marriages were often of convenience, being a means of materially strengthening the family. In those cases, adultery was seen as a logical addition to marriage. Now let's remember marital duty. Isn’t it strange that this action, pleasant in every sense, was equated with duty? to responsibilities, therefore, to the marriage partner. A sense of duty……… it’s about self-sacrifice….. the willingness to sacrifice one’s interests for the sake of the interests of the partner. Such self-sacrifice is possible and not burdensome when one spouse identifies himself with the other. In addition, by loving a friend, we love our own good, for “a good person, having become our friend, becomes good” (Aristotle). The same can be said about spouses between whom a strong friendship has been established, then fidelity acts as a moral duty to the partner. Loyalty... they always talk about it when we talk about any union, about belonging to something. Loyalty to the obligations that a person once assumed is the binding knot for this union. The most ancient cultural monuments have brought to us the praise and glorification of fidelity. Loyalty is about the value of the obligations undertaken. After all, no one at the moment of concluding a marriage allows the thought “well, this is all about a cliche, but you can love with anyone.” On the one hand, in modern marriage, fidelity is regulated by moral categories, on the other, and legal sanctions take place, since betrayal is a sufficient basis for divorce. All this material is written in order to say - there are moments, periods, crises in marriage when one of the spouses feels for some time free from marital obligations, which include fidelity , but the question is that someone manages to survive these periods without negative consequences, and someone allows themselves to betray. And here, I agree with our classic N.A. DobrolyubovThe measure of moral relations between spouses is their upbringing, culture, responsibility to each other, and willingness to live for others. A person can live in others, enjoy someone else's joy, someone else's happiness. If someone does not feel such an ability in himself, it means that he has not yet developed enough truly human elements in himself, which means that animal needs predominate in him too much.