What is love? It is that thing you develop on seeing girls in NIIT class, GRE coaching class, tuition class, same electronics & communication class. It is acheived by BE-senior-taking-junior-to-culturals, 2nd-year-MS-helping-first-year-do-groceries-by-driving-her-around-in-a cheap-4th-hand-car, and finally also by being a rakhi-brother-promoted-to-lover.
If I were to make a conjecture, I would say - Love is a complex emotion. Being brought up in a exam-oriented environment most of us approach "love" as they would approach exams. This is a profound thing I learned about love. For example, if you want to ace an exam you can sit for 20 hours a day and crack it. Love is not that. Why? because Love depends on other people and other people are random. This takes away any structure out of the process and any hope of putting an algorithm. You might have heard "hard work leads to success" and stuff like that. But those are on things you can control. When it comes to love a person can do a helluva lot of hard work and it can amount nothing. Because minds are fickle. There is no more random thing than a person's mind. Hard work may not influence minds. I have seen people do a million things to impress a girl and it still turned out to counter productive. And there is no damn reason why that should be so. But thats how it is because you never know which direction minds will run for a given stimuli.
From talking to people who have indulged in this whole love thing. I think love gets compounded second-over-second at a rate of 26000000 (echoose me.. finance class going on) mainly because of the extended fantasy sequences that goes on in the mind. The person-in-love imagines being with the girl, talking to her, kissing her, doing the fun stuff. Any advt, movie sequence the person sees, he extrapolates that stuff to apply to him and that 'special girl'. So without the girl being aware that he exists, he has (mentally) spent a zillion hours with her, kissed her 56,700 times, made love twice as much and had 3 kids too. So while he approaches her assuming the fantasy thing is reality, the girl still is focussed on the real reality. The girl could infact be thinking about some one else and going through the whole cycle. Most girls/boys dont realize that there is a big link-list of love-and-unrequited-love going on. If only the person down the list knew what was going on in the mind of the person who rejected him/her. So a lot of the many who fall in love actually develop the gumption to propose. This could lead to a spectrum ranging from, "you spoilt the friendship", "I dont know why you got the vibe", "let me think about it" and even a possible "yes! thank! same here".
See... I think rejection is one of the things every person has to get over in life. Friends reject you, Employers reject you, colleges reject you, credit cards reject you and finally members of the opposite sex reject you. It is tough when it happens. But you move on. Everybody moves on. Its stupid not to move on. I personally believe (like many do) that "what doesn't kill you -- only helps you". Brooding on lost love and using that to ignore other important things is escapism. That will certainly kill you :-). The idea is to get on with it. It is tough but you have to get on with it. And you know what? You will move on. Thats the nature of life. In about 3 months, I have seen the same romeo's feel happy, hate the girl and actively pursue other girls. There is no loyalty in hanging on to the past and thinking about the same girl. That is no loyalty. Loyalty is to self and for that you have to move on. To be frank in about 6 months it wont be a big deal. To be brutally frank it is not a big deal. People can live without a lot of things. Love is easily one of them.
There is no point blaming the girl or telling others "she used me" etc. The girl is doing whats best for her. I am reminded of Kamal hassan's quote in an interview (sometimes he says awesome things). A person walks on the road and he steps over an insect without knowing it. Does it mean he has a vengance against the insect or has something against it. No! It is his nature to do that. He is doing his job and it is the nature of the insect to be stamped. The way I look at it - That is the way things have been arranged.