what is love???

i dont understand!!! Why? Y it will only hurt ppls?? or even will take away ppls life??? what is the main problem actually????
it should bring ppls happiness bring ppls joys...but at the end??
Basically the problem is cause by human himself.
There is also a word always cause all this case-----revenge
when he/she cant get the 1 they love, at this time, love will make ppls think negative side.... they will keep think think think............
what they think??
they will think how to revenge, how i can make her/him in a trouble.... how to make her/him regret.... how to make her/him hurt like how the 1 hurt them....haizzz....wat a love war???
example:
my fren,  a gal
she fall in love to the guy which she reject b4, but the guy is lik dam fcuker!!!
Ask her do this do that, ask her to prove she love him in different way....
the gal follow , she prove it !!
but the guy act like nothing!! Fucker
he act lik he dunno who the gal is refering, he can be the best actor i think, he go say wit the gal : waa!! u gt bf d?? congrats, ur bf leng chai ma???.....wtffffff haizzz this is just a small part of the story!!! n it is just the begining of all this!!!
BEWARE!!! CAUTION!!!not hot!! is pain is love!!!
maybe is just a small misunderstand , but a small misunderstanding cause a big big hole in love...... believe ur love 1 n the 1 who love u!!! this is wat called love!!! love should be forever, not 1day 2weeks 3months or 4years