God created animals without the ability to know the good and the bad: no animal has a soul and therefore, has no destination after death.
They cannot dignify between parents, children, sisters, cousins and lovers: every opposite gender is suitable for mating in their Kingdom. They have no regard for permanence in marriage, and they desist from courtship.
Although few of the animals, like the pigeons, are known to be committed to their partners, even after death – their courtship cannot be in the manner of human beings.
“Courtship in animals is the behaviour by which different species select their partners for reproduction. Usually, the male starts the courtship, and the female chooses to either mate or reject the male based on his “performance””.
According to the Bible, God commanded that no man could kill another man but that men could kill animals for food, “Surely for your lifeblood I will demand a reckoning; from the hand of every beast I will require it, and from the hand of man. From the hand of every man’s brother I will require the life of man.
“Whoever sheds man’s blood, By man his blood shall be shed; For in the image of God He made man”. Gen 9:5-6, NKJV.
The distinctions between human beings and the beasts show that we all have the tendency to do what is right and everyone should be responsible for what s/he does
Perhaps, a mental disorder is responsible for the inability of a number of people to keep to their relationships: many people find it difficult to stick to a person in a relationship.
Once they see any attractive man or woman – passed by: they become restive. Their hormones will begin to run wild and they will not be able to control themselves again until, eventually, they find themselves in the hands of those people they are admiring.
These people seem to have character-traits with animals: animals are known for not being able to dignify their partners; they live promiscuous life and are never sued for it.
Animals do not complain of infidelity: they embrace it
When two male animals fight over a female animal, it is not because they (both) love the female one, but because they are fighting over who will mate with the female. The female animals will not chase away the male which has the upper hand: she will either accept or reject his advances.
A man or a woman that has no taste but runs after every lady or that accepts advances from every man is also like an animal. Only when you learn to accept and appreciate a faithful partner that you have: you will remain in the category of animals.
God created us to choose good or bad things
“Behold, I set before you this day a blessing and a curse — The blessing if you obey the commandments of the Lord your God which I command you this day; And the curse if you will not obey the commandments of the Lord your God, but turn aside from the way which I command you this day to go after other gods, which you have not known.” Deut 11:26-28, AMP.
Morality agrees with separation when a partner is not faithful in a relationship, and the Bible teaches against defiling the bed of marriage.
This is to tell you that you have power over what you do: you can control what you do and not that what you do can control you.
To be faithful in relationship, courtship and marriage is a thing of choice.
Although, it is also spiritual in part: much effort lay in your hands.
It is not so easy to live prudent life if you do not leave out the friends that cause you to indulge in unfaithfulness and other immoral acts. “Do not be deceived: “Bad company corrupts good morals””. 1 Cor 15:33, NASU.
You also need Jesus in your life: you should confess and accept Him as your Lord and Saviour so that the Holy Spirit could teach you all that you should do.
We are not animals: we can be faithful to our partners without thinking twice. Animals disregard dignity of their mates, but we have power over our wills.
 Wikipedia, Courtship in animals.