Because they are not being fulfilled in the relationship.
Well it ussually matters how devoted the two people in the relationship are. If one person thinks the relationship means nothing to the other person and it means nothing to themselves then that person will probably cheat first. It's not a matter of the gender.
monogamy is when you have a relationship with one person and one person only you don't cheat on them it doesn't mean that you have to stay with that person for the rest of you life it just means you can't have sexual or romantic relationships with anyone other than that person while you ARE in a relationship with them
Parasitic relationship means that when one person benefits from the other person but the other person does not benefit.
A relationship with someone who is 'really not into you'. You may also call it a one sided relationship, which is not really a relationship at all.
One of the ways to tell if it will last is how much you love each other. If you love them more than anything and you cannot spend one minute apart from them, then you know that your relationship will most definitely last if the other person feels the same way that you do. If you cheat or lie then your relationship won't last.
check out some other girls or guys and then see if you like one of them and then tell that person how you feel talk to that person and see how they feel just please don't cheat
It means that person is asking the other one out on a date or to be in a relationship with them.
both. you cant have one with out the other
People cheat as they are not satisfied with one person. They love to move with other people.
It takes only one person to break up a relationship, but it takes two to make or to re-establish one. You have to talk to the other person; if the relationship is not wanted by you both, then it cannot happen.
An opportunistic relationship is one in which a person takes advantage of another person or people with no regard for moral principles or the consequences the other person or people might suffer.
There is no cheat, if you want Sims to get married you build their relationship up to a romantic one and then have one of them propose.