would be it worth treating someone nicely even though he/she has treated you like shit? you may not think that one has treated you like that as you think that is normal, but to an outsider it is like shit. You have been nice to that person because you have felt in love with one and perhaps, as a result of that 'love', all you do are to get his attention such as act nicely ( 'hopefully he/she will love me back'!!). Would it be worth to do so when you have no clue on what will it be in the future? he/ she may just still a stranger, a fren, a mate, or....
In order to make that things work, one must have courage to say it out, but there will be a consequence such as u may be rejected or even accepted, well it is depended on respond from another party. If it is rejected, sometimes the feeling of 'shame' may come out especially if these two persons are the type who meet each other every day, there will be awkward feeling, nothing will be the same. However, it will be a 'major happiness' when the answer is 'yes'.
After all ths efforts, i think it is depended on the parties themselves and whether they do have fate to be with each other, it may be ridiculous to believe in fate but without it nothing will work out, no matter how hard you try to be nice and try to get to know one. Sometimes, it is unfair things in this world where one party may in deeply in love with the other party but nothing in return from the other party, it hurts. Why can it be where one party love the other party and the other party love that person back? in such a case, there will be no pain, which i think is good.

Another issue in my mind is , last year during my final year undergraduate course in Bristol, i used to listen to people greeting each other by saying 'hey u alrite' ( probably a short term for hey are u alrite?). However, this year, I am getting use to listen people say 'hey, how is it going' 'wht u been up to '
' wht u been up to' is ok but 'how is it going' how are we going to reply when there is nothing going on?