relationship.. is it needed?

i've been thinking abt dis for quite a long time.. sometimes we think we like someone separuh mati but then whn something happen, u cn just forget abt him/her in such a short time... in a  blink of eye.. we just go on with life n leave all dat sad memory behind. we cant deny dat we totally forgot abt it... we still keep it in mind... mayb ade sikit jauh ati abt dat particular incident but we try to act like nothing happen btween u and him or u and her.. then, u bump into someone else n start a new relationship with him/her... so, how to differentiate between u like someone damn much or dat person is just a crush?? hmm.... these days, most teenagers want and longing for a relationship... i mean boy-girl relationship... it is compulsory to b in dat r/ship? its ok 2 like someone or maybe its better if both d girl n d boy like each other.. tp mesti ke ble dah same2 suke tu, kene move one more step - kapel..? d answer is only - yes or no... everyone hs their own opinion abt dis... my stand?? secret.......