Realistically, that's just not really in human nature. That's why divorce rates have been so high since the re-birth of marriage as an institution of love.
Most divorces happen around 3-7 years with 3-4 years being with the most occurrences ,so loving someone forevrrrrr or strict long-life monogamy being against human nature don't seem to be the problem here,unless you mean its against human nature to love someone more then 3 years?the that will put a huge hole in your alternative theory that its human nature instead to form long-term semi monogamous relationship because 3-7 years are neither strict long-life monogamy nor a terribly long time to love someone. Third the high divorce rate are more to do with divorce being far more accessible and culturally acceptable today then about love marriages.Fourth breakups are far more complex then ur reductionist reasons .The top reason for divorces are jumping into marriage for wrong reason ,infedility ,However,as been shown extensively , usually there is an underlying reason that causes a spouse to cheat including anger, resentment, having varied interests, growing apart, or unequal sexual appetites.Weight Gain:Surprisingly enough, "forever after" often comes with the caveat "as long as you maintain your figure.Money,Lack of Communication,and physical and emotional abuse.Incompatibility:Nothing stays the same. Over time people grow, develop, and change. Sometimes, individual growth can mean that growing apart from their spouse. When parties lives, interests, or dreams become incompatible, the marriage can begin to suffer as a result. Incompatibility can also lead to a spouse seeking interaction with a person of the opposite sex, which can lead to infidelity.unhappiness:Unhappiness lies at the root of a high number of divorces. Sometimes individuals don't realize that love in and of itself is not enough to keep you happy. Also, some people get married, and then realize that they are not cut out for
marriage.Addiction,age:According to a study published by the Wharton school at Pennsylvania University, cites the age at which a couple gets married playing a role in the likelihood of their divorce. Couples that get married at a young age often deal with money issues, lack of maturity, lack of communication, and issues that develop from growing apart.Parenting Style Differences
arenting is an even larger undertaking than getting married. Once children come into the picture, priorities change, lifestyles change, and for sure sleeping habits. According to Attorney Jeff Biddle, differences in parenting styles is a major reason couples seek divorce.Falling out of love,which usually has complex underlying reason :They stopped communicating. Conflict went unresolved, needs went unexpressed, and affirmations went unspoken. They took each other for granted. It’s easy to assume that love is unconditional and to subsequently get lazy with each other. When respect and kindness disappear, so can the love.Expectations weren't met. In the beginning, it’s easy to accommodate your partner’s needs and wishes. Over time, however, people often default to “just being themselves” and stop bending to the expectations of their partner if those expectations are not shared ones. One of them discovered something new about his/her partner. Betrayal can radically alter how someone feels about their partner. Discovering that your partner has hidden something from you, cheated on you, or behaved in a way that’s inconsistent with who you thought they were can do irreparable damage to the relationship. Overwhelming jealousy took over,when jealousy takes over, there’s no room for trust. The relationship wasn't built on a solid foundation. If the relationship started poorly, moved too fast in the beginning, or was the product of an affair, it’s likely not rooted enough to withstand time or overcome any real relationship obstacles. Incompatibility. As a couple gets to know one another better — and the initial fireworks die down — they may discover that their lifestyles, priorities, and values don’t align. Boredom. Or exhaustion. The relationship has either lost its spark or become too much work for one or both people to handle.A major life event changed things. She’s given birth and he no longer sees her as a lover, just as a mother. He got fired and suddenly retreats into depression and refuses her help. Instead of embracing life’s adventures together, some couples crack under the pressures of hardships or the unknown.It wasn't love in the first place. Lust can disguise itself as love. Once the honeymoon is over, however, it can also leave a relationship feeling empty and lacking.So humans are not wired with a love gas that fades in the long term.We don't see humans having issues with loving their children ,friends and family forever do we?its just that with romantic relationships there are far more complexities,expectations and challenges that can hinder the growth of love.