Because from a Male's point if view
(Please note this may just be me) the older brother wants the sis to be alone because he wants to protect her and the Female wants her brother free because she doesn't like the girl or because she thinks her brother could do better.
girlfriend
No! Quite the opposite, actually. They hated each other's guts.
because sometimes the girlfriend's boyfriend felt left out on something and maybe wanted the girlfriend to be jelous so they get back 2gether. also the girlfriend's boyfriend is maybe attracted to the other opposite sex
Disbelief, body, or physical. Those words are the opposite of psychology.
A swain is male admirer, a beau, a boyfriend; a female is a female admirer, a girl, a girlfriend, or leman, a word for sweetheart, lover, or mistress, as old fashioned as swain.
Reverse Psychology
Two waves of equal magnitude but opposite phase interfere with one another to cause the waves to disappear. This is caused by
tell your brother that his girlfriend said bad stuff about him and then same the opposite to his girlfriend
Swain is a term that traditionally refers to a young lover or suitor, typically a man. The opposite gender would be "maid" or "maiden."
Just because you are boyfriend and girlfriend does not mean either of you cannot talk to the opposite sex. Just because your boyfriend talks to another girl doesn't mean he doesn't love you. You have the right to talk to any boy out there if you so choose. If an individual cannot deal with their boyfriend or girlfriend talking to the opposite sex then that person has little confidence in themselves or could be overly jealous. The way around problems is to have good communication skills (one is never too young or too old to learn communication skills) and be open and honest with your boyfriend and he should be the same with you. This often takes any doubt out of your mind and you can both learn something from each other and mature as you go along in your relationship.
Answer I think it's mainly because teens are in that stage of their lives where they believe that having a girlfriend (or a boyfriend) is the most important thing in the world. A lot of teenagers are also going through puberty so have crushes on other teens of the opposite sex. Sooner or later, however, they're going to realize that it's not important to have a girlfriend (or boyfriend) and that there is still time before they have to worry about that. WERE JUST THAT COOL!!!
The answer to this question depends on yourself. If both people in the relationship are okay with not having a title then there is nothing wrong with not having a title. Some people prefer to casual date or just hang out as friends with the opposite sex.