Its pretty straight forward. Some people have poor egos and self esteem and feel better by being in a relationship. These people have a obsessive need to be loved and usually these people will hook up with some very...unsavory, people.
The funny thing is that the person usually needs security. They are probably very chaotic in regards to their social life, not to mention very picky. Therefor they need someone who they feel can always be there for them. The ironic thing is that these people tend to be very promiscuous, must i mention that nearly 80% of cheating is purely emotional. Once they have satisfied the challange of winning someone over, or more often than not being won over, they quickly lose interest and begin an orgy of flirting.
serverhost is right although sometimes the person constantly needing to be in a relation(seriously not gf or bf) is a little '"chronic" maybe due to the fact that he / she has a fear or something like that so she needs him her to feel safe and secure,and some needs the comfort of his / her family/best friends,like serverhost said,as it makes them feel good and satisfied,but sometimes its becos you feel alone,really,I felt that before when my grandparents died,and just because youre in a crowd doesent mean you dont feel lonely anymore.Its like say a shop you like cloced down and you cant buy their products anymore
I have some friends like that. They are like the persons who ask all the time "do you love me?". It's probably because they have a confidence problem and want to hear always someone saying you are good and only compliments make them forget their low self-esteem.
ITT: Kids saying being in relationships makes people weak and dependent in order to cover up the fact that they couldn't take that nerdy girl who watches anime all programming class to the prom if they had 3 million dollars in the bank.